Recent Changes - Search:

French.Flowhood History

Hide minor edits - Show changes to output

Changed line 29 from:
(:include English/FlowhoodEbay:)
to:
(:include English/EbayFilter:)
Changed line 29 from:
(:include FlowhoodEbay:)
to:
(:include English/FlowhoodEbay:)
Changed line 31 from:
(:include FlowhoodSources:)
to:
(:include English/FlowhoodSources:)
Changed lines 31-149 from:
(:table border=0 cellpadding=5 cellspacing=0 width=100% align=center:)
(:cellnr:)
'''USA'''
%newwin%[[http://www.aafilters.com | www.aafilters.com]]
%newwin%[[http://www.airexco.com/tdhepa.htm | www.airexco.com]]
%newwin%[[http://www.airflotek.com | www.airflotek.com]]
%newwin%[[http://www.appliedairtechnology.com/hepa_filters.htm | www.appliedairtechnology.com]]
%newwin%[[http://www.camfilfarr.com | www.camfilfarr.com]]
%newwin%[[http://www.filtera-b2b.com/businessfilters/hepa.htm | www.filtera-b2b.com]]
%newwin%[[http://www.filterservicesil.com/products.asp?type=T&category=17 | www.filterservicesil.com]]
%newwin%[[http://www.flandersffi.com/ | www.flandersffi.com]]
%newwin%[[http://www.fungi.com/tools/airfilters.html | www.fungi.com]]
%newwin%[[http://www.hepa.com/products/family_standard.asp |  www.hepa.com]]
%newwin%[[http://www.hepafilters.com/CFS/hepa_filters.htm |  www.hepafilters.com]]
%newwin%[[http://www.laminaire.com/hepa_filters.htm | www.laminaire.com]]
%newwin%[[http://www.lifetimeind.com/specs_hepa.asp | http://www.lifetimeind.com]]
%newwin%[[http://www.techrite.com/catalog/clean_room_filters_243922_products.htm | www.techrite.com]]
%newwin%[[http://www.tridim.com/higheff.html | www.tridim.com]]

%newwin%[[http://www.thomasregisterdirectory.com/filters/hepa_filters_0042215_1.html | USA Filter search web site]]

'''Autriche'''
%newwin%[[http://czech.at | www.czech.at]]
%newwin%[[http://www.aaf.at/frames/produkte/epa_upa_filter.htm | www.aaf.at]]
%newwin%[[http://www.vokesair.at | www.vokesair.at]]

'''Bulgarie'''
%newwin%[[http://uspeh.dir.bg/hepa.htm | uspeh.dir.bg/hepa.htm]]

'''Canada'''
%newwin%[[http://www.tridim.ca/page/hepafilters.htm | www.tridim.ca]]

'''Réplublique tchèque'''
%newwin%[[http://www.elfa-aaf.cz/ | www.elfa-aaf.cz]]
%newwin%[[http://www.filco.cz/client/content.asp?Action=SelCat&IDCat=49 | www.filco.cz]]
%newwin%[[http://www.ksklimaservice.cz/?page=p12_en  | www.ksklimaservice.cz]]

'''Danemarque'''
%newwin%[[http://www.industrifilter.dk | www.industrifilter.dk]]

'''France'''
%newwin%[[http://www.aaf-sa.fr/ | www.aaf-sa.fr]]
%newwin%[[http://www.climavent.fr | www.climavent.fr]]

'''Allemagne'''
%newwin%[[http://www.aaf-lufttechnik.de/content/framesets/fshaupt.htm | www.aaf-lufttechnik.de]]
%newwin%[[http://www.atex-filter.de | www.atex-filter.de]]
%newwin%[[http://www.camfil.de | www.camfil.de]]
%newwin%[[http://www.cleanroom.de | www.cleanroom.de]]
%newwin%[[http://www.luftfilterbau.de | www.luftfilterbau.de]]
%newwin%[[http://www.euro-filter.de/internet/waren417.htm | www.euro-filter.de]]
%newwin%[[http://www.filtega.de/index.php?id=32 | www.filtega.de]]
%newwin%[[http://www.het-filter.de | www.het-filter.de]]
%newwin%[[http://www.reinraum.de | www.reinraum.de]]
%newwin%[[http://www.spxairfiltration.eu/index.php?id=50&L=3&K=3| www.spxairfiltration.eu]]
%newwin%[[http://www.wieninger-filter.de/page/schwebstoffilter.html | www.wieninger-filter.de]]

%newwin%[[http://www.way2business.de/b3764 | Filtertechnik-Deutschland]]

(:cell:)

'''Inde'''
%newwin%[[http://www.aeromechindia.com/hepa_filters.htm | www.aeromechindia.com]]
%newwin%[[http://www.multilab.biz | www.multilab.biz]]

'''Israel'''
%newwin%[[http://www.filt-air.com/|www.filt-air.com]]

'''Italie'''
%newwin%[[http://www.altifilter.com|www.altifilter.com]]
%newwin%[[http://www.defil.it/filabs.htm|www.defil.it]]
%newwin%[[http://www.eurofiltri.com/filtrialtaefficienza.html|www.eurofiltri.com]]
%newwin%[[http://www.ma-in.com/prodotti/filtri_Ma.In/filtri_assoluti.htm|www.ma-in.com]]
%newwin%[[http://www.mcleodrussel.it|www.mcleodrussel.it]]

%newwin%http://www.google.it/search?q=filtri+assoluti

'''Les Pays-bas'''
%newwin%[[http://www.mcleodrussel.nl|www.mcleodrussel.nl]]

'''Norvège'''
%newwin%[[http://www.aafluftfilter.no/hepa.htm | www.aafluftfilter.no]]

'''Russie'''
%newwin%[[http://www.ftov.ru | www.ftov.ru]]

'''Slovénie'''
%newwin%[[http://www.ecotip.si/eng/filter_06.htm | www.ecotip.si]]

'''Afrique du Sud'''
%newwin%[[http://www.filtrationgroup-spx.com/gb_airsales_za.htm|www.filtrationgroup-spx.com/gb_airsales_za.htm]]

'''Espagne'''
%newwin%[[http://www.filtrationgroup-spx.com/gb_airsales_e.htm | www.filtrationgroup-spx.com/gb_airsales_e.htm]]

'''Suède'''
%newwin%[[http://www.scandfilter.se | www.scandfilter.se]]

'''Suisse'''
%newwin%[[http://www.cleanair.ch | www.cleanair.ch]]
%newwin%[[http://www.logicair.ch|www.logicair.ch]]
%newwin%[[http://www.reinraumtechnik.lume.ch/  |www.reinraumtechnik.lume.ch ]]
%newwin%[[http://www.sit.ch/  | www.sit.ch]]
%newwin%[[http://www.tecnofil.ch/  | www.tecnofil.ch]]
%newwin%[[http://www.unifil.ch | www.unifil.ch]]
%newwin%[[http://www.vokes-air.ch/gb_hepa.html  |www.vokes-air.ch]]
%newwin%[[http://www.trion-elektrofilter.ch  |www.trion-elektrofilter.ch]] ([[English/trion-elektrofilter-ch|details]])
%newwin%[[http://www.wesco.ch  |www.wesco.ch]] ([[English/wesco-ch|details]])

'''UK'''
%newwin%[[http://www.hepa.co.uk/ | www.hepa.co.uk]]
%newwin%[[http://www.filtrationgroup-spx.com/VokesAir/|www.filtrationgroup-spx.com/VokesAir/]]

'''Turquie'''
%newwin%[[http://www.relax-air.com/4/products/hepa_ve_ulpa_filtreler.htm | www.relax-air.com]]
%newwin%[[http://www.aaf.com.tr/secim_cizelgesi.htm | www.aaf.com.tr]]
 
%newwin%[[http://www.aafeurope.com/europe/fs/cont/ma-cont.htm | Worldwide]]
(:tableend:)
to:
(:include FlowhoodSources:)
Changed lines 137-139 from:
%newwin%[[http://www.trion-elektrofilter.ch  |www.trion-elektrofilter.ch]] ([[trion-elektrofilter-ch|details]])
%newwin%[[http://www.wesco.ch  |www.wesco.ch]] ([[wesco-ch|details]])
to:
%newwin%[[http://www.trion-elektrofilter.ch  |www.trion-elektrofilter.ch]] ([[English/trion-elektrofilter-ch|details]])
%newwin%[[http://www.wesco.ch  |www.wesco.ch]] ([[English/wesco-ch|details]])
Changed lines 1-2 from:
(:title Laminar Flow Hood - Build a HEPA filter flowhood:)
to:
(:title Hotte de ventilation laminaire - Construire une hotte avec un filtre HEPA:)
Changed line 10 from:
'-rapport de liens morts, les commentaires et les suggestions sont toujours les bienvenues -'
to:
'- Le rapport des liens inactifs, les commentaires et suggestions sont toujours les bienvenues -'
February 09, 2007, at 03:14 AM by LewisCarroll - Hotte de ventilation laminaire - Construire une hotte avec un filtre HEPA
February 09, 2007, at 03:14 AM by LewisCarroll - Hotte de ventilation laminaire - Construire une hotte avec un filtre HEPA
February 09, 2007, at 03:14 AM by LewisCarroll - Hotte de ventilation laminaire - Construire une hotte avec un filtre HEPA
February 09, 2007, at 03:12 AM by LewisCarroll - Hotte de ventilation laminaire - Construire une hotte avec un filtre HEPA
Changed line 123 from:
'''Espangne'''
to:
'''Espagne'''
Changed lines 168-169 from:
->2pieds x 1pieds = 2 pieds'^2^'
to:
->2pieds x 1pied = 2 pieds'^2^'
Changed lines 174-175 from:
Alors 200 ft'^3^'/min(= pcm = "pieds cube par minute") est la quantité d'air que votre souffleur doit fournir ''' à la somme des PRESSIONS STATIQUES du filtre HEPA et du pré-filtre'''.
to:
Alors 200 pieds'^3^'/min(= pcm = "pieds cube par minute") est la quantité d'air que votre souffleur doit fournir ''' à la somme des PRESSIONS STATIQUES du filtre HEPA et du pré-filtre'''.
Changed lines 174-175 from:
Alors 200 ft'^3^'/min(= pcm = "pieds cube par minute") est la quantité d'air que votre souffleur doit fournir à la somme des PRESSIONS STATIQUES du filtre HEPA et du pré-filtre'''.
to:
Alors 200 ft'^3^'/min(= pcm = "pieds cube par minute") est la quantité d'air que votre souffleur doit fournir ''' à la somme des PRESSIONS STATIQUES du filtre HEPA et du pré-filtre'''.
Changed lines 204-205 from:
Le schéma dans ce tutoriel utilise [[http://www.google.com/search?q=In-line%2BCentrifugal%2BFan | in-line centrifugal fan ventilateur centrifugeur en ligne]], une autre bonne option (en fait une des plus utilisée pour les hottes de ventilation) est un[[http://www.google.com/search?q=squirrel%2Bcage%2Bblower | squirrel cage blower | souffleur cage d''écureuil]] (également appelé [[http://www.google.com/search?q=shaded%2Bpole%2Bblower | shaded pole blower, souffleur à scrutin ombragé]]).
to:
Le schéma dans ce tutoriel utilise un [[http://www.google.com/search?q=In-line%2BCentrifugal%2BFan | in-line centrifugal fan | ventilateur centrifugeur en ligne]], une autre bonne option (en fait une des plus utilisée pour les hottes de ventilation) est un [[http://www.google.com/search?q=squirrel%2Bcage%2Bblower | squirrel cage blower | souffleur cage d'écureuil]] (également appelé [[http://www.google.com/search?q=shaded%2Bpole%2Bblower | shaded pole blower, souffleur à scrutin ombragé]]).
Changed lines 239-240 from:
Une ouverture est découpée dans la paroi de dessus pour caller l''entrée d'air du souffleur.
to:
Une ouverture est découpée dans la paroi de dessus pour caller l'entrée d'air du souffleur.
Changed lines 8-10 from:
!Laminar Flow Hood - Build a HEPA filter flowhood
'-( updated: {$LastModified} )-'

'-dead link reports, comments and suggestions welcome any time-'
to:
!Hotte de ventilation laminaire – Construisez une hotte avec un filtre HEPA
'-( mis à jour le: {$LastModified} )-'
'-rapport de liens morts, les commentaires et les suggestions sont toujours les bienvenues
-'
Changed lines 17-28 from:
A laminar flow hood is a very useful piece of equipment which makes sterile working procedures in mushroom cultivation easier and reliable.

A flow hood consists of a coarse pre-filter, a blower and a very fine filter (the so called HEPA (High Efficiency Particulate Air) filter which filters particles from the air to such a high degree such that the air coming out of the HEPA filter is nearly sterile.

This alows doing transfers in this stream of sterile air without worrying about contaminants entering from the air and contaminating the
cultures.

You should begin the construction by selecting a HEPA filter and a blower.  

The
HEPA filter size depends on how big you want to have your working space. The smallest filter size you can reasonably use (for home scale cultivation) is 1ft x 1ft, better though 1ft x 2ft.

!!!Some sources for HEPA filters

to:
Une hotte de ventilation laminaire est un appareil très pratique permettant d’effectuer un travail stérile de manière simple et sûre.

Une hotte consiste d’un pré-filtre épais, d’un souffleur et d’un filtre extrêmement fin, le dénommé filtre HEPA ( High Efficiency Particulate Air) qui filtre les particules dans l’aire à un tel dégré que l’air sortant du filtre HEPA est casiment stérile.

Ceci permet de faire des transferts dans un flux d’air stérile sans avoir à se soucier des contaminants que l’air pourrait véhiculer dans les
cultures.

Vous devriez commencer la construction en sélectionnant un filtre HEPA et un souffleur.

La taille du filtre
HEPA dépend de la surface de travail que vous désirez. La plus petite taille de filtre que vous pouvez raisonnablement utilser (pour une culture à l’échelle de la maison) est de 1 pied x 1 pied, bien que 1 pied x 2 pieds soit un peu mieux.

!!!Quelques sources pour les filtres HEPA

Changed line 52 from:
'''Austria'''
to:
'''Autriche'''
Changed line 57 from:
'''Bulgaria'''
to:
'''Bulgarie'''
Changed line 63 from:
'''Czech republic'''
to:
'''Réplublique tchèque'''
Changed line 68 from:
'''Denmark'''
to:
'''Danemarque'''
Changed line 75 from:
'''Germany'''
to:
'''Allemagne'''
Changed line 92 from:
'''India'''
to:
'''Inde'''
Changed line 99 from:
'''Italy'''
to:
'''Italie'''
Changed line 108 from:
'''Netherlands'''
to:
'''Les Pays-bas'''
Changed line 111 from:
'''Norway'''
to:
'''Norvège'''
Changed line 114 from:
'''Russia'''
to:
'''Russie'''
Changed line 117 from:
'''Slovenia'''
to:
'''Slovénie'''
Changed line 120 from:
'''South Africa'''
to:
'''Afrique du Sud'''
Changed line 123 from:
'''Spain'''
to:
'''Espangne'''
Changed line 126 from:
'''Sweden'''
to:
'''Suède'''
Changed line 129 from:
'''Switzerland'''
to:
'''Suisse'''
Changed line 144 from:
'''Turkey'''
to:
'''Turquie'''
Changed lines 151-186 from:
!!!Matching a blower to the filter
Once you decided on the size of the HEPA filter, you have to match a suitable blower to this particular filter. This is a very important step, so make sure to study the directions thoroughly.

Every filter has a "resistance" when air blows through it at a certain speed, this resistance is called the "static pressure".

Press your hand against your mouth. Now try to blow through it. Dependant on how firm you press it against your mouth, you will have some difficulties blowing air out and you will feel some resistance, this is the static pressure.

Every filter has a different static pressure at the working point. The working point is where the amount of the air flowing through the filter is sufficient to meet the requirement of the laminar flow.

The static pressure is expressed in inch of water column in the english units, a typical value would be 1", the SI unit for pressure is Pa(Pascal).

1" water column is around 250 Pa
. Each filter has a data sheet (consult the manufacturer if this is not the case with your filter) where the static pressure at the working point is entered. Before the air enters the blower it is usually pre-filtered by a furnace filter around 1"(2.5cm) thick placed in front of the blower to protect it and the HEPA filter from big particles like dust and hairs. It can be assumed that the static pressure for this prefilter at the working point is around 0.2"(50 Pa)

According to Stamets ([[http://www.amazon.com/exec/obidos/ASIN/0961079800/theshroomery-20/ | '''Paul Stamets and J.S.Chilton: The Mushroom Cultivator''']] p. 347 ff) the air speed of the air flowing from the filter surface should be (at least) '''100 feet per minute
(fpm)'''.(around 30 meter per minute or 0.5 meter per second). Determining the correct blower for a filter consists of several steps:

1. Find out the area of your filter by '''multiplying the width and the hight
''' in feet (for instance the smallest reasonably usable filter would be 2ft x 1ft)

->2ft x 1ft = 2 ft'^2^'

2. Multiply the required air speed(the one Stamets specifies
, 100 ft/min) with the area of your filter

->100 ft/min x 2 ft'^2^' = 200 ft'^3^'/min

So 200 ft'^3^'/min(= cfm = "cubic feet per minute") is the amount of air your blower must deliver '''at the sum of the STATIC PRESSURE of the HEPA filter + prefilter
'''.

'''NOTE:''' 1 cfm= 1.7m
'^3^'/h

So if you use the above filter with 1"(250Pa) static pressure and a furnace prefilter with a static pressure of 0.2"(50Pa) your blower must deliver
'''200 cfm(340m'^3^'/h) of air at a static pressure of 1.2"(300Pa).'''

'''Finding the correct blower'''
Every blower should have a data sheet with a characterisitc curve that shows the air output in dependance of the static pressure
. Every blower has a data sheet (consult the manufacturer if this is not the case with your blower) where the correlation between the '''flow''' and the '''static pressure''' is represented by a graph or table.

Here is such a set of curves for 4 blowers
(numbered 1-4). 
'''NOTE: '''Each model of a blower has his own characteristical curve. This chart shows the curvers for 4 different particular models of axial duct blowers.
What you can clearly see is that '''the bigger the static pressure the less air the blower delivers''', up to the maximum static pressure where the air output is zero
.
to:
!!!Trouver un souffleur pour le filtre
Une fois que vous vous êtes décidé sur la taille du filtre HEPA, vous devez trouver un souffleur adéquat qui corresponde au filtre que vous avez acheté. C'est une étape très importante alors assurez-vous de bien étudier les instructions qui vont suivrent.

Chaque filtre a une "résistance" lorsque l’air souffle au travers à une certaine vitesse, cette résistance est appelée la "pression statique".

Appuyez et pressez avec votre main sur votre bouche. Essayez ensuite de souffler à travers. En relation à la fermeté avec laquelle vous pressez sur votre bouche, vous éprouverez quelques difficultées à expulser l'air et vous constaterez une certaine résistance. Cette résistance est la pression statique.

Chaque filtre possède un pression statique différente à son point de travail. Le point de travail est atteint lorsque la quantité d'air sortant du filtre est suffisante pour permettre à la hotte de souffler un flux d'air permettant de garder les contaminants à distance.

La pression statique est exprimée en pouce de colomne d'eau dans l'unité anglaise
. Une valeure typique serait 1" (pouce), l'unité standart internationale (SI) pour la pression est le Pa (Pascal).

1 pouce de colomne d'eau correspond à peux près à 250 Pa. Chaque filtre possède une fiche technique (consulter le fabricant si ce n'est pas le cas avec le votre) où la pression statique au point de travail est inscrite. Avant que l'air n'entre dans le souffleur, elle est préalablement filtrée par un filtre de four d'à peu près 1" (2.5cm) d'épaisseure plassé en face du souffleur pour le protéger ainsi que le filtre HEPA de plus grosses particules de poussière ou de poils divers. On peut dire que la pression statique au point de travail pour ce filtre est de 0.2"
(50 Pa).

D
'après Stamets ([[http://www.amazon.com/exec/obidos/ASIN/0961079800/theshroomery-20/ | '''Paul Stamets and J.S.Chilton: The Mushroom Cultivator''']] p. 347 ff) la vitesse de l'air sortant de la surface du filtre doit être d'au moins 100 pieds par minute. A peux près 30 mètres par minutes or 0,5 mètres par seconde. Afin de déterminer un souffleur adéquate pour votre filtre, il faut suivre quelques étapes:

1. Trouver la surface de votre filtre en multipliant la largeur et la hauteur en pieds ( par exemple, le plus petit filtre utilisable serait de 2 pieds sur 1 pied)

->2pieds x 1pieds = 2 pieds
'^2^'

2
. . Multiplier la vitesse de l'air requis (celle que Stamets spécifies, 100 pieds/min) avec la surface de votre filtre

->100 pieds/min x 2 pieds'^2^' = 200 pieds
'^3^'/min

Alors
200 ft'^3^'/min(= pcm = "pieds cube par minute") est la quantité d'air que votre souffleur doit fournir à la somme des PRESSIONS STATIQUES du filtre HEPA et du pré-filtre'''.

'''NOTE:''' 1 pcm= 1.7m'^3^'/h

Alors si vous utilisez le filtre ci-dessus avec 1"(250Pa) de pression statique et un préfiltre de four avec une pression statique de 0,2", votre souffleur doit produire
'''200 pcm(340m'^3^'/h) d'air à une pression statique de 1.2"(300Pa).'''

'''Trouver le bon souffleur'''
Chaque souffleur devrait possèder une ficher technique avec un courbe charactéristique indiquant le flux de sortie relatif à une pression statique. Chaque souffleur possède un fiche technique (consultez le fabriquant si ce n'est pas le cas avec votre souffleur) où la corrélation entre le '''flux''' et la '''pression statique''' se trouve représentée par un graphique ou une table.

Voici à quoi ressemblent ces courbes pour 4 souffleurs (numérotés de 1 à 4).
'''NOTE: '''Chaque modèle de souffleur possède ses propres courbes charactéristiques. Ce diagramme montre les courbes de 4 modèles particuliers de souffleurs axiaux.Ce que vous pouvez clairement constater est que '''plus la pression statique est élevée, moins la quantité d'air fournie sera importante''' jusqu'à atteindre la pression statique maximale où la sortie d'air est de zéro
.
Changed lines 188-189 from:
Sometimes these data are presented in form of a table.
to:
Quelques fois ces données sont fournies sous forme d'une table.
Changed lines 192-210 from:
By now you know how much your blower must deliver and at which static pressure. In our example it was 340m'^3^'/h at 300Pa.
So what we do now is to go in this chart and find the value of 300Pa
('''=1.2"''') at the vertical axis. Then you move to the right until you reach 340m'^3^'/h.('''=200cfm''') 
Now, ideally there should be a curve of a blower going exactly trough this point, but this is not allways the case.
So we have to choose a blower that best approximates our requirements. 
In most cases we should choose a stronger blower, if it's not too strong.
How strong is too strong
? I´d say the blower shouldn´t deliver more that 20% more air than we calculated, so in our case the strongest acceptable blower would be around 400m'^3^'/h.
In this example we have a blower that delivers 300m'^3^'/h(according to our calculation it should deliver 340m'^3^'/h though). This is a difference of mere 10%. The next stronger blower in this chart delivers 530m'^3^'/h at 300Pa, which is way too much.

In this case we go for the smaller(and cheaper) blower(Nr.4) instead of the much bigger one(Nr.1, which delivers 530m'^3^'/h at 300Pa), despite the fact that it´s generally recomended to take a stronger one.

'''NOTE:''' This chart is only an example for a set of 4 particular blowers. The curves of the blowers available to you may look a bit different, but similar. 
Usually, if you search long enough, you will be able to find a blower that exactly matches your
HEPA.

The design in this pictorial uses an [[http://www.google.com/search?q=In-line%2BCentrifugal%2BFan | in-line centrifugal fan]], another good option (actually the one most commonly used for flow hoods) is a [[http://www.google.com/search?q=squirrel%2Bcage%2Bblower | squirrel cage blower]] (also called [[http://www.google.com/search?q=shaded%2Bpole%2Bblower | shaded pole blower]]).

You can get all of the above items at [[http://www.tkqlhce.com/7o70uoxuowBDJKGCLGBHLCECIL | www.ebay.com]], often at much cheaper prices than if you bought them directly.

!!Construction of the hood
to:
Maintenant vous savez combien votre souffleur doit expulser et à quelle pression statique. Dans notre exemple, il s'agissait de 340m'^3^'/h à 300Pa.
Ce que nous allons faire maintenant est de nous reporter au diagramme et trouver la valeur de('''=1.2"''') ") sur l'axe vertical. Ensuite vous vous déplacé vers la droite jusqu'à ce que vous atteignez 340m'^3^'/h.('''=200pcm''') 
Maintenant, idéalement il devrait y avoir une courbe  d'un souffleur qui passerait à travers ce point mais ce n'est pas toujours le cas.
Nous devons donc choisir un souffleur don’t les performances s'approchent de nos attentes.Dans la plus part des cas, nous devrions choisir un souffleur plus puissant s'il n'est pas trop puissant.
Trop puissant, c'est combien
? Je dirais que le souffleur ne devrait pas délivrer plus du 20% d'air que ce que nous avons calculé auparavant. Alors dans notre cas, le souffleur acceptable le plus puissant devrait délivrer 400m'^3^'/h.
Dans cet exemple nous avons un souffleur qui délivre 300m'^3^'/hh (bien qu'en accord avec notre calcul, il devrait délivrer 340m'^3^'/h). Il s'agit la d'une différence de plus de 10%. Le prochain souffleur plus puissant  dans ce diagramme délivre  530m'^3^'/h at 300Pa, ce qui est beaucoup trop.

Malgré qu'il soit recommendé de prendre un souffleur plus puissant, dans ce cas nous opterons pour le souffleur Nr.4  plus petit et meilleur marché à la place du Nr.1 beaucoup trop puissant qui délivre 530m'^3^'/h à 300Pa.

'''NOTE:''' : Ce diagramme n'est qu'un exemple pour un lot de 4 souffleurs particuliers. Les courbes des souffleurs que vous avez à disposition peuvent être légèrement différentes mais restent assez similaires.
Normalement, Si vous cherchez assez longtemps, vous trouverez un souffleur qui corresponde exactement à votre filtre
HEPA.

Le schéma dans ce tutoriel utilise [[http://www.google.com/search?q=In-line%2BCentrifugal%2BFan | in-line centrifugal fan ventilateur centrifugeur en ligne]], une autre bonne option (en fait une des plus utilisée pour les hottes de ventilation) est un[[http://www.google.com/search?q=squirrel%2Bcage%2Bblower | squirrel cage blower | souffleur cage d''écureuil]] (également appelé [[http://www.google.com/search?q=shaded%2Bpole%2Bblower | shaded pole blower, souffleur à scrutin ombragé]]).

Vous pouvez trouver tous les articles ci-dessus chez [[http://www.tkqlhce.com/7o70uoxuowBDJKGCLGBHLCECIL | www.ebay.com]], souvent à des prix bien meilleurs que si vous les achetiez directement!

!!Construction de la hotte
Changed lines 212-215 from:
After you bought the HEPA filter and a matching blower , you have to get some materials for the construction of the box that will accommodate the above 2 components.
Basically you want to build a box, the front wall of the box will consist of the
HEPA filter, and another wall will have the inlet of the blower with the pre filter mounted. I had the material for the walls already cut to fit the size of the filter and the blower.
I begin by gluing and screwing the filter to the bottom wall.

to:
Après avoir acheté le filtre HEPA et souffleur correspondant vous devez encore trouver du matériel pour la construction de la boîte qui va disposer des deux éléments ci-dessus.De manière général, c'est une boîte que vous voulez construire. La paroie frontale de la boîte est faite avec le filtre HEPA et une autre paroie comprendra l'entrée d'air pour le souffleur avec le préfiltre monté. Pour les parois, je me suis procuré des matériaux déjà coupés pour correspondre à la taille du filtre et du souffleur.Je commence par coller et visser le filtre à la paroi de dessous.
Changed lines 218-219 from:
Then I add the side walls....
to:
Ensuite j'ajoute les parois latérales…
Changed lines 226-227 from:
....and the back wall.
to:
.et la paroi de derrière.
Changed lines 233-234 from:
The blower will be mounted so the inlet is at the top.
to:
Le souffleur est installé de manière à ce que l'entrée d'air se trouve vers le haut.
Changed lines 239-240 from:
A hole is cut in the wall at the top to accommodate the blower inlet.
to:
Une ouverture est découpée dans la paroi de dessus pour caller l''entrée d'air du souffleur.
Changed lines 246-247 from:
The blower rests on a bar mounted in the box. The white dots on the bar is some(already dried) silicone mass to provide some damping and lessens vibrations. All the joints are filled with silicone mass so the box is airtight.
to:
Le souffleur repose sur une bare montée dans la boîte. Les points blancs sur la bare sont des bouts de mastique de silicone offrant un certain amortissement et permettant de minimiser les vibrations. Toutes les jointures sont mastiquées au silicone de manière à rendre la boîte hermétique à l'air.
Changed lines 252-253 from:
The top with the blower is screwed on the box. The space around the opening and all other cracks in the box are tightened with silicone mass.
to:
La paroi du dessus avec le souffleur est vissée sur la boîte. L'espace autour de l'ouverture et toutes les fissures autour de la boîte sont fermées avec du mastique. 
Changed lines 258-259 from:
A pre filter is mounted atop of the blower. I use a furnace filter, you can also use other filers, like car air filters, just make sure they are large enough and that they don´t have too much air resistance, otherwise you would need a larger blower.
to:
Un pré-filtre est installé au-dessus de la hotte. J'utilise un filtre de four, vous pouvez également utiliser d'autres filtres comme des filtres à air de voiture. Il faut juste vous assurer qu'ils soient assez grand et qu'ils n'offrent pas trop de résistance à l'air, autrement vous auriez besoin d'un filtre plus puissant.
Changed lines 264-265 from:
Detail of the pre-filter.
to:
Détail du pré-filtre.
Changed lines 271-272 from:
A net is tackered to the frame of the HEPA filter to prevent touching and harming the delicate filter.
to:
Un filet est agraffé au cadre du filtre HEPA pour éviter de le toucher et de l'âbimer.
Changed lines 277-278 from:
The finished flow hood.
to:
La hotte de ventilation terminée.
Changed lines 283-286 from:
Some pictures of a similar design, the only difference is that the blower is mounted around 10 cm deeper, so the pre filer is in the same level as the rest of the box. Makes it more visually appealing and more compact this way.

Yet more pictures of the design on the right can be found in the
[[http://www.fungifun.org/English/Gallery?mode=album&album=flowhood|gallery]]
to:
Quelques photos de styles similaires. La seule différence consiste dans le fait que le souffleur est installé 10 cm plus en profondeur, de manière à ce que le pré-filtre se situe à la même hauteur que le reste de la boîte. Ce qui le rend un peu plus attrayant à l'œil et plus compact.

Plus de photos des styles sur la droite peuvent être trouvées dans la
[[http://www.fungifun.org/English/Gallery?mode=album&album=flowhood|gallery]]
Changed lines 294-295 from:
A link to a very good tutorial on flowhood construction applying a different design:
[[http://www.orchideenvermehrung.at/cgi-local/framebreaker/reload.pl?english/lfh/index.htm|Laminar flow hood construction]]
to:
Un lien vers un très bon tutoriel sur la construction des hottes de ventilation avec des styles différents:
[[http://www.orchideenvermehrung.at/cgi-local/framebreaker/reload.pl?english/lfh/index.htm| construction de hottes de ventilation]]
Added lines 1-299:
(:title Laminar Flow Hood - Build a HEPA filter flowhood:)

(:table border=0 cellpadding=5 cellspacing=0 width=100% align=center:)
(:cell:)
Pfpics:shroom_zwerg1.gif

(:cell align=center:)
!Laminar Flow Hood - Build a HEPA filter flowhood
'-( updated: {$LastModified} )-'
'-dead link reports, comments and suggestions welcome any time-'
[[English/Contact | Pfpics:brief.gif]]

(:cell:)
Pfpics:shroom_zwerg.gif
(:tableend:)

A laminar flow hood is a very useful piece of equipment which makes sterile working procedures in mushroom cultivation easier and reliable.

A flow hood consists of a coarse pre-filter, a blower and a very fine filter (the so called HEPA (High Efficiency Particulate Air) filter which filters particles from the air to such a high degree such that the air coming out of the HEPA filter is nearly sterile.

This alows doing transfers in this stream of sterile air without worrying about contaminants entering from the air and contaminating the cultures.

You should begin the construction by selecting a HEPA filter and a blower. 

The HEPA filter size depends on how big you want to have your working space. The smallest filter size you can reasonably use (for home scale cultivation) is 1ft x 1ft, better though 1ft x 2ft.

!!!Some sources for HEPA filters

(:include FlowhoodEbay:)

(:table border=0 cellpadding=5 cellspacing=0 width=100% align=center:)
(:cellnr:)
'''USA'''
%newwin%[[http://www.aafilters.com | www.aafilters.com]]
%newwin%[[http://www.airexco.com/tdhepa.htm | www.airexco.com]]
%newwin%[[http://www.airflotek.com | www.airflotek.com]]
%newwin%[[http://www.appliedairtechnology.com/hepa_filters.htm | www.appliedairtechnology.com]]
%newwin%[[http://www.camfilfarr.com | www.camfilfarr.com]]
%newwin%[[http://www.filtera-b2b.com/businessfilters/hepa.htm | www.filtera-b2b.com]]
%newwin%[[http://www.filterservicesil.com/products.asp?type=T&category=17 | www.filterservicesil.com]]
%newwin%[[http://www.flandersffi.com/ | www.flandersffi.com]]
%newwin%[[http://www.fungi.com/tools/airfilters.html | www.fungi.com]]
%newwin%[[http://www.hepa.com/products/family_standard.asp |  www.hepa.com]]
%newwin%[[http://www.hepafilters.com/CFS/hepa_filters.htm |  www.hepafilters.com]]
%newwin%[[http://www.laminaire.com/hepa_filters.htm | www.laminaire.com]]
%newwin%[[http://www.lifetimeind.com/specs_hepa.asp | http://www.lifetimeind.com]]
%newwin%[[http://www.techrite.com/catalog/clean_room_filters_243922_products.htm | www.techrite.com]]
%newwin%[[http://www.tridim.com/higheff.html | www.tridim.com]]

%newwin%[[http://www.thomasregisterdirectory.com/filters/hepa_filters_0042215_1.html | USA Filter search web site]]

'''Austria'''
%newwin%[[http://czech.at | www.czech.at]]
%newwin%[[http://www.aaf.at/frames/produkte/epa_upa_filter.htm | www.aaf.at]]
%newwin%[[http://www.vokesair.at | www.vokesair.at]]

'''Bulgaria'''
%newwin%[[http://uspeh.dir.bg/hepa.htm | uspeh.dir.bg/hepa.htm]]

'''Canada'''
%newwin%[[http://www.tridim.ca/page/hepafilters.htm | www.tridim.ca]]

'''Czech republic'''
%newwin%[[http://www.elfa-aaf.cz/ | www.elfa-aaf.cz]]
%newwin%[[http://www.filco.cz/client/content.asp?Action=SelCat&IDCat=49 | www.filco.cz]]
%newwin%[[http://www.ksklimaservice.cz/?page=p12_en  | www.ksklimaservice.cz]]

'''Denmark'''
%newwin%[[http://www.industrifilter.dk | www.industrifilter.dk]]

'''France'''
%newwin%[[http://www.aaf-sa.fr/ | www.aaf-sa.fr]]
%newwin%[[http://www.climavent.fr | www.climavent.fr]]

'''Germany'''
%newwin%[[http://www.aaf-lufttechnik.de/content/framesets/fshaupt.htm | www.aaf-lufttechnik.de]]
%newwin%[[http://www.atex-filter.de | www.atex-filter.de]]
%newwin%[[http://www.camfil.de | www.camfil.de]]
%newwin%[[http://www.cleanroom.de | www.cleanroom.de]]
%newwin%[[http://www.luftfilterbau.de | www.luftfilterbau.de]]
%newwin%[[http://www.euro-filter.de/internet/waren417.htm | www.euro-filter.de]]
%newwin%[[http://www.filtega.de/index.php?id=32 | www.filtega.de]]
%newwin%[[http://www.het-filter.de | www.het-filter.de]]
%newwin%[[http://www.reinraum.de | www.reinraum.de]]
%newwin%[[http://www.spxairfiltration.eu/index.php?id=50&L=3&K=3| www.spxairfiltration.eu]]
%newwin%[[http://www.wieninger-filter.de/page/schwebstoffilter.html | www.wieninger-filter.de]]

%newwin%[[http://www.way2business.de/b3764 | Filtertechnik-Deutschland]]

(:cell:)

'''India'''
%newwin%[[http://www.aeromechindia.com/hepa_filters.htm | www.aeromechindia.com]]
%newwin%[[http://www.multilab.biz | www.multilab.biz]]

'''Israel'''
%newwin%[[http://www.filt-air.com/|www.filt-air.com]]

'''Italy'''
%newwin%[[http://www.altifilter.com|www.altifilter.com]]
%newwin%[[http://www.defil.it/filabs.htm|www.defil.it]]
%newwin%[[http://www.eurofiltri.com/filtrialtaefficienza.html|www.eurofiltri.com]]
%newwin%[[http://www.ma-in.com/prodotti/filtri_Ma.In/filtri_assoluti.htm|www.ma-in.com]]
%newwin%[[http://www.mcleodrussel.it|www.mcleodrussel.it]]

%newwin%http://www.google.it/search?q=filtri+assoluti

'''Netherlands'''
%newwin%[[http://www.mcleodrussel.nl|www.mcleodrussel.nl]]

'''Norway'''
%newwin%[[http://www.aafluftfilter.no/hepa.htm | www.aafluftfilter.no]]

'''Russia'''
%newwin%[[http://www.ftov.ru | www.ftov.ru]]

'''Slovenia'''
%newwin%[[http://www.ecotip.si/eng/filter_06.htm | www.ecotip.si]]

'''South Africa'''
%newwin%[[http://www.filtrationgroup-spx.com/gb_airsales_za.htm|www.filtrationgroup-spx.com/gb_airsales_za.htm]]

'''Spain'''
%newwin%[[http://www.filtrationgroup-spx.com/gb_airsales_e.htm | www.filtrationgroup-spx.com/gb_airsales_e.htm]]

'''Sweden'''
%newwin%[[http://www.scandfilter.se | www.scandfilter.se]]

'''Switzerland'''
%newwin%[[http://www.cleanair.ch | www.cleanair.ch]]
%newwin%[[http://www.logicair.ch|www.logicair.ch]]
%newwin%[[http://www.reinraumtechnik.lume.ch/  |www.reinraumtechnik.lume.ch ]]
%newwin%[[http://www.sit.ch/  | www.sit.ch]]
%newwin%[[http://www.tecnofil.ch/  | www.tecnofil.ch]]
%newwin%[[http://www.unifil.ch | www.unifil.ch]]
%newwin%[[http://www.vokes-air.ch/gb_hepa.html  |www.vokes-air.ch]]
%newwin%[[http://www.trion-elektrofilter.ch  |www.trion-elektrofilter.ch]] ([[trion-elektrofilter-ch|details]])
%newwin%[[http://www.wesco.ch  |www.wesco.ch]] ([[wesco-ch|details]])

'''UK'''
%newwin%[[http://www.hepa.co.uk/ | www.hepa.co.uk]]
%newwin%[[http://www.filtrationgroup-spx.com/VokesAir/|www.filtrationgroup-spx.com/VokesAir/]]

'''Turkey'''
%newwin%[[http://www.relax-air.com/4/products/hepa_ve_ulpa_filtreler.htm | www.relax-air.com]]
%newwin%[[http://www.aaf.com.tr/secim_cizelgesi.htm | www.aaf.com.tr]]
 
%newwin%[[http://www.aafeurope.com/europe/fs/cont/ma-cont.htm | Worldwide]]
(:tableend:)

!!!Matching a blower to the filter
Once you decided on the size of the HEPA filter, you have to match a suitable blower to this particular filter. This is a very important step, so make sure to study the directions thoroughly.

Every filter has a "resistance" when air blows through it at a certain speed, this resistance is called the "static pressure".

Press your hand against your mouth. Now try to blow through it. Dependant on how firm you press it against your mouth, you will have some difficulties blowing air out and you will feel some resistance, this is the static pressure.

Every filter has a different static pressure at the working point. The working point is where the amount of the air flowing through the filter is sufficient to meet the requirement of the laminar flow.

The static pressure is expressed in inch of water column in the english units, a typical value would be 1", the SI unit for pressure is Pa(Pascal).

1" water column is around 250 Pa. Each filter has a data sheet (consult the manufacturer if this is not the case with your filter) where the static pressure at the working point is entered. Before the air enters the blower it is usually pre-filtered by a furnace filter around 1"(2.5cm) thick placed in front of the blower to protect it and the HEPA filter from big particles like dust and hairs. It can be assumed that the static pressure for this prefilter at the working point is around 0.2"(50 Pa)

According to Stamets ([[http://www.amazon.com/exec/obidos/ASIN/0961079800/theshroomery-20/ | '''Paul Stamets and J.S.Chilton: The Mushroom Cultivator''']] p. 347 ff) the air speed of the air flowing from the filter surface should be (at least) '''100 feet per minute(fpm)'''.(around 30 meter per minute or 0.5 meter per second). Determining the correct blower for a filter consists of several steps:

1. Find out the area of your filter by '''multiplying the width and the hight''' in feet (for instance the smallest reasonably usable filter would be 2ft x 1ft)

->2ft x 1ft = 2 ft'^2^'

2. Multiply the required air speed(the one Stamets specifies, 100 ft/min) with the area of your filter

->100 ft/min x 2 ft'^2^' = 200 ft'^3^'/min

So 200 ft'^3^'/min(= cfm = "cubic feet per minute") is the amount of air your blower must deliver '''at the sum of the STATIC PRESSURE of the HEPA filter + prefilter'''.

'''NOTE:''' 1 cfm= 1.7m'^3^'/h

So if you use the above filter with 1"(250Pa) static pressure and a furnace prefilter with a static pressure of 0.2"(50Pa) your blower must deliver '''200 cfm(340m'^3^'/h) of air at a static pressure of 1.2"(300Pa).'''

'''Finding the correct blower'''
Every blower should have a data sheet with a characterisitc curve that shows the air output in dependance of the static pressure. Every blower has a data sheet (consult the manufacturer if this is not the case with your blower) where the correlation between the '''flow''' and the '''static pressure''' is represented by a graph or table.

Here is such a set of curves for 4 blowers(numbered 1-4). 
'''NOTE: '''Each model of a blower has his own characteristical curve. This chart shows the curvers for 4 different particular models of axial duct blowers.
What you can clearly see is that '''the bigger the static pressure the less air the blower delivers''', up to the maximum static pressure where the air output is zero.

Flowhood:curves.gif

Sometimes these data are presented in form of a table.

Flowhood:chart.gif

By now you know how much your blower must deliver and at which static pressure. In our example it was 340m'^3^'/h at 300Pa.
So what we do now is to go in this chart and find the value of 300Pa('''=1.2"''') at the vertical axis. Then you move to the right until you reach 340m'^3^'/h.('''=200cfm''') 
Now, ideally there should be a curve of a blower going exactly trough this point, but this is not allways the case.
So we have to choose a blower that best approximates our requirements. 
In most cases we should choose a stronger blower, if it's not too strong.
How strong is too strong? I´d say the blower shouldn´t deliver more that 20% more air than we calculated, so in our case the strongest acceptable blower would be around 400m'^3^'/h.
In this example we have a blower that delivers 300m'^3^'/h(according to our calculation it should deliver 340m'^3^'/h though). This is a difference of mere 10%. The next stronger blower in this chart delivers 530m'^3^'/h at 300Pa, which is way too much.

In this case we go for the smaller(and cheaper) blower(Nr.4) instead of the much bigger one(Nr.1, which delivers 530m'^3^'/h at 300Pa), despite the fact that it´s generally recomended to take a stronger one.

'''NOTE:''' This chart is only an example for a set of 4 particular blowers. The curves of the blowers available to you may look a bit different, but similar. 
Usually, if you search long enough, you will be able to find a blower that exactly matches your HEPA.

The design in this pictorial uses an [[http://www.google.com/search?q=In-line%2BCentrifugal%2BFan | in-line centrifugal fan]], another good option (actually the one most commonly used for flow hoods) is a [[http://www.google.com/search?q=squirrel%2Bcage%2Bblower | squirrel cage blower]] (also called [[http://www.google.com/search?q=shaded%2Bpole%2Bblower | shaded pole blower]]).

You can get all of the above items at [[http://www.tkqlhce.com/7o70uoxuowBDJKGCLGBHLCECIL | www.ebay.com]], often at much cheaper prices than if you bought them directly.

!!Construction of the hood

(:table border=0 cellpadding=5 cellspacing=0 width=100% align=center:)
(:cellnr:)
After you bought the HEPA filter and a matching blower , you have to get some materials for the construction of the box that will accommodate the above 2 components.
Basically you want to build a box, the front wall of the box will consist of the HEPA filter, and another wall will have the inlet of the blower with the pre filter mounted. I had the material for the walls already cut to fit the size of the filter and the blower.
I begin by gluing and screwing the filter to the bottom wall.

(:cell align=center:)
[[Flowhood:hood01.JPG|Flowhood:hood01__scaled_340.jpg]]

(:cellnr:)
Then I add the side walls....

(:cell align=center:)
[[Flowhood:hood012.jpg|Flowhood:hood02__scaled_340.jpg]]
[[Flowhood:hood03.JPG|Flowhood:hood03__scaled_340.jpg]]
[[Flowhood:hood04.JPG|Flowhood:hood04__scaled_340.jpg]]

(:cellnr:)
....and the back wall.

(:cell align=center:)
[[Flowhood:hood05.JPG|Flowhood:hood05__scaled_340.jpg]]
[[Flowhood:hood06.JPG|Flowhood:hood06__scaled_340.jpg]]

(:cellnr:)
The blower will be mounted so the inlet is at the top.

(:cell align=center:)
[[Flowhood:hood07.JPG|Flowhood:hood07__scaled_340.jpg]]

(:cellnr:)
A hole is cut in the wall at the top to accommodate the blower inlet.

(:cell align=center:)
[[Flowhood:hood08.JPG|Flowhood:hood08__scaled_340.jpg]]
[[Flowhood:hood09.JPG|Flowhood:hood09__scaled_340.jpg]]

(:cellnr:)
The blower rests on a bar mounted in the box. The white dots on the bar is some(already dried) silicone mass to provide some damping and lessens vibrations. All the joints are filled with silicone mass so the box is airtight.

(:cell align=center:)
[[Flowhood:hood10.JPG|Flowhood:hood10__scaled_340.jpg]]

(:cellnr:)
The top with the blower is screwed on the box. The space around the opening and all other cracks in the box are tightened with silicone mass.

(:cell align=center:)
[[Flowhood:hood11.JPG|Flowhood:hood11__scaled_340.jpg]]

(:cellnr:)
A pre filter is mounted atop of the blower. I use a furnace filter, you can also use other filers, like car air filters, just make sure they are large enough and that they don´t have too much air resistance, otherwise you would need a larger blower.

(:cell align=center:)
[[Flowhood:hood12.JPG|Flowhood:hood12__scaled_340.jpg]]

(:cellnr:)
Detail of the pre-filter.

(:cell align=center:)
[[Flowhood:hood13.JPG|Flowhood:hood13__scaled_340.jpg]]
[[Flowhood:hood15.JPG|Flowhood:hood15__scaled_340.jpg]]

(:cellnr:)
A net is tackered to the frame of the HEPA filter to prevent touching and harming the delicate filter.

(:cell align=center:)
[[Flowhood:hood14.JPG|Flowhood:hood14__scaled_340.jpg]]

(:cellnr:)
The finished flow hood.

(:cell align=center:)
[[Flowhood:hood16.JPG|Flowhood:hood16__scaled_340.jpg]]

(:cellnr:)
Some pictures of a similar design, the only difference is that the blower is mounted around 10 cm deeper, so the pre filer is in the same level as the rest of the box. Makes it more visually appealing and more compact this way.

Yet more pictures of the design on the right can be found in the [[http://www.fungifun.org/English/Gallery?mode=album&album=flowhood|gallery]]

(:cell align=center:)
[[Flowhood:flowhood_02280002.JPG|Flowhood:TN_flowhood_02280002.JPG]][[Flowhood:flowhood_02280004.JPG|Flowhood:TN_flowhood_02280004.JPG]]
[[Flowhood:flowhood_02280006.JPG|Flowhood:TN_flowhood_02280006.JPG]][[Flowhood:flowhood_02280008.JPG|Flowhood:TN_flowhood_02280008.JPG]]
[[Flowhood:flowhood_02280009.JPG|Flowhood:TN_flowhood_02280009.JPG]][[Flowhood:flowhood_02280011.JPG|Flowhood:TN_flowhood_02280011.JPG]]

(:tableend:)

A link to a very good tutorial on flowhood construction applying a different design:
[[http://www.orchideenvermehrung.at/cgi-local/framebreaker/reload.pl?english/lfh/index.htm|Laminar flow hood construction]]
Edit - History - Print - Recent Changes - Search
Page last modified on October 21, 2017, at 11:41 AM