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Vertical Flow Laminar Flowhood


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#1 dillinger

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Posted 09 December 2006 - 03:51 AM

Just in the middle of building a 2x1' hepa filtered laminar flowhood.using a 525cfm fan.

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#2 shobimono

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Posted 09 December 2006 - 10:16 AM

Nice, please keep the pics coming!

#3 dillinger

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Posted 09 December 2006 - 11:20 AM

also working on a FAE systems. Not sure what material to use. I am thinking of using plywood, but treating it well. Would i be able to treat the wood well enought that it will be fine in 90% humidity?
Spring return Damper, motorized
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CO2 controller and relay
http://mushroomclima...oxycoating.html
http://mushroomclimate.com/relays.html
http://mushroomclima...laycontrol.html
also using a 12*12*6 HEPA Filter 99.99% eff
and a 525 cfm blower...is that too big of a blower for that filter size?

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#4 Hippie3

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Posted 09 December 2006 - 11:27 AM

no, it sounds just about right. i didn't crunch the numbers, though.

i would not use plywood though.
for the money/time you're investing
a few bucks more for good wood is worthwhile, imo.

#5 dillinger

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Posted 09 December 2006 - 11:30 AM

i'm using the maple finishing plywood. Doesn't shrink and expand like lumber would. Is that okay

#6 Hippie3

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Posted 09 December 2006 - 11:34 AM

yes, it's ok.
just not the best.
might want to cap the ends of the plywood with formica strips,
as years pass by humidity can cause the plywood layers to
separate and then the exposed glue can breed microbes...

#7 dillinger

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Posted 09 December 2006 - 11:40 AM

what would my best option be

should i just use ducting or some other material other than wood?

#8 Hippie3

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Posted 09 December 2006 - 11:54 AM

i enclosed my cabinet in formica laminate, easy to clean, tough too.
but for that FAE system i reckon metal duct would work very nicely.

#9 dillinger

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Posted 09 December 2006 - 12:06 PM

i was affriad of that, my dad doesn't let me use his tin snips and my mom won't let me use sharp objects...duct it is though

#10 Hippie3

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Posted 09 December 2006 - 12:22 PM

:lol:

#11 dillinger

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Posted 09 December 2006 - 05:08 PM

just finsihed most of the top, still need to seal a couple edges.

The bottom still needs the pexiglass front. It ready to go, just need to screw it in.

The middle pic is a pic of a peice i put in so that the fan doesn't directly smash air into the filter, but instead hits the plate and creates a positive pressure chamber.

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#12 dillinger

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Posted 10 December 2006 - 08:39 PM

here are some more pics, the pexiglas front, which covers half the hole was removed because i only put it up temporarily with duct tape. I ran out of caulk and it was late, tomorrow i will make it more permanent, with screws and caulk (Hmmm, do those two words belong in the same sentense?).
I let it run, the injected 9 rye jars, i kept them open for 10 seconds each to see if they get contaminated. The window may have been sucking air in, so who knows. No big loss.

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#13 Hippie3

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Posted 11 December 2006 - 10:29 AM

i'd still add some pressed formica panels to
box in and extend the work area
like so-

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#14 BuckarooBanzai

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Posted 11 December 2006 - 11:11 PM

Is that just a small hole (compared to the filter size) between the blower area and the filter area?

I suck at visualizing stuff like this, but I'm thinking I see a smallish rectangular hole allowing the air pressure to move between the blower area and the filter. Am I seeing it right?

#15 dillinger

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Posted 12 December 2006 - 11:11 AM

the whole top is the filter... i didn't end up putting on a top peice of wood, just a huge furnace filter. The hole in the front is to make the blower fit. it was just short of fitting that one part by half an inch, so i cut out a small peiceout. I haven't covered it up yet, but since the intake is to the right of it, it doesn't really even suck in air. When i put a lighter in front of it, it just stayed up right.


i am going to make a larger flowhood now, this was just practice and for small agar work. I may extend its size though, i was thinking just several inches would do me for now.


Its not bad though, i stack the jars and i can easily fit about 12 in with enough room for me to work. 1 only make 8-10 jars at a time anyways. Also its mostly for agar work and there is plenty of room for pouring and clone work.

#16 sandman

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Posted 12 December 2006 - 12:44 PM

I as well am having trrouble visualising how this thing is set up. It apears very odd. It should be from top to bottom pre filter at the very top, then blower sitting through a peice of wood, then a plenum of about 10" or so, then the hepa and thats it. Im not sure what the extra holes in the side are for? Maybe some better pictures are in orer.

#17 dillinger

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Posted 12 December 2006 - 01:33 PM

I as well am having trrouble visualising how this thing is set up. It apears very odd. It should be from top to bottom pre filter at the very top, then blower sitting through a peice of wood, then a plenum of about 10" or so, then the hepa and thats it. Im not sure what the extra holes in the side are for? Maybe some better pictures are in orer.


that is exactly how it is. prefilter top, then a blower, which is mounted on a board, then a 10" plenum, then the filter.

There were 2 holes:
A) on the side where the hepa slides in, that was sealed with a ring of caulking around the hole and a peice of plywood.
b)The hole in the front, is to allow the blower to fit. It still needs to be sealed. It is there because the measurments were off. I forgot to allow for the rubber feet that attach the blower to the back wall, so it doesn't vibrate. this hole does not really effect the performance of the system since it isn't even sucking in air. The air intake is to the side of it and pulls air down from the top.

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