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OfflineFreeSporePrints
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Registered: 03/06/05
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Suggestions on the structure of the flowhood.
    #8348420 - 05/01/08 02:25 AM (15 years, 10 months ago)

Hi,
after half year i've still to assemble my flowhood.

i've bought a hepa h14 91,5cm x 61cm, to work without any problem with spawn bags.

I've problems of space in my house, so i'd like study the best solution for a compacted flowhood.

I've thought to put the blower into the box of the flowhood, but i don't know if this can create to me problems, because it's a strong fan.




Do you suggest the solution 1 or 2?

Into the solution one there's a wall of plywood with a hole large like the hole of the fan, in this way the air won't go directly on the flowhood, "pushing" with more force into some point of the hepa. in the second solution there are some "ailerons" to direct the air in the different point of the hepa, but in this case the box of the hepa should be a bit bigger.

What do you think?

Thanks,
Fabio

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Invisibleohmatic
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Re: Suggestions on the structure of the flowhood. [Re: FreeSporePrints]
    #8348995 - 05/01/08 10:03 AM (15 years, 10 months ago)

neither nore, direct flow on your filter can harm it in the long run.

take a look at the way i constructed my flowhood, i put the filter behind the blower
so it blows down into a box, creating static pressure which then goes through the filter.

this is far easier on the filters delicate surface.

http://www.shroomery.org/forums/showflat.php/Number/6631268#6631268


--------------------
:penis: MONOTUB tek :sun: HEATBOMB tek :penis:

RIP #cultivation! ....can't associate? well FUCK U !

Edited by ohmatic (05/01/08 10:04 AM)

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OfflineHotnuts
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Re: Suggestions on the structure of the flowhood. [Re: ohmatic]
    #8349121 - 05/01/08 11:04 AM (15 years, 10 months ago)

The whole idea of the plenum is, for it to fill up with air causing static pressure, thus evenly distributing air throughout the filter. In turn laminar flow is achieved. Perfectly dispersed air flowing into the filter because of the pressurized plenum.

Edited by Hotnuts (05/01/08 02:05 PM)

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Invisiblelipa

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Re: Suggestions on the structure of the flowhood. [Re: FreeSporePrints]
    #8349237 - 05/01/08 11:38 AM (15 years, 10 months ago)

FSP

Send me all the right measurements for your fan and filter and I will program a hood correctly for you. I will cad up all pieces for you and send you a blueprint for it. I need to know all of the specifications for you devices as well. It will only take me less than a week.

I will make it as compact as I can.:cool:

We can then also post the dxf and blueprint files  up and maybe make a collection of them in the long run too share with all.:thumbup:

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OfflineFreeSporePrints
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Re: Suggestions on the structure of the flowhood. [Re: lipa]
    #8352285 - 05/02/08 01:16 AM (15 years, 10 months ago)

hi mates,
thanks for the answers.

@ohmatic: i've a "mushroom" blower, because they're cheaper(cheaper a shit, i've paid it 265€!!), and is very large (344 mm in diameter)...the sizes of the flowhood won't be so compatec, but thanks, i'll keep your setup in mind.

@Hotnuts: can you gently re-explain it? My english comprension is low :laugh:

@lipa: thanks! i send you a PM.

Fabio

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OfflineHotnuts
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Re: Suggestions on the structure of the flowhood. [Re: FreeSporePrints]
    #8353236 - 05/02/08 10:53 AM (15 years, 10 months ago)

The plenum area is the area behind the filter, where the blower pushes air into. When the blower is mounted 90 degrees to the filter, blowing air into that area, back pressure is caused in the plenum area and serves as a perfect distributor for the air flowing into the filter. If the blower is mounted in a way where it blows straight into the filter, it will cause the flow to be uneven going into the filter, thus being uneven coming out causing turbulence, not laminar flow. The back pressure (static pressure) gets to a certain amount in the plenum area and then starts to flow evenly into the filter.

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OfflineAnnoA
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Re: Suggestions on the structure of the flowhood. [Re: FreeSporePrints]
    #8353513 - 05/02/08 12:00 PM (15 years, 10 months ago)

Like this:
http://www.fungifun.org/WikiSandbox

And get a fan speed control.

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OfflineFreeSporePrints
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Re: Suggestions on the structure of the flowhood. [Re: Anno]
    #8356240 - 05/02/08 11:59 PM (15 years, 10 months ago)

yes perhaps my first pic wasn't clear, but the pics are the top section of the flowhood, the blower will beon the bottom of the plenum, instead the hole of the plenum will be at the top, so no direct air will go on the hepa.

The problem for me is this: a little space like 5 or 7 cm between the blower and the "wall" of the plenum will be a problem?

Thanks,
Fabio

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OfflineMyc II
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Re: Suggestions on the structure of the flowhood. [Re: FreeSporePrints]
    #8362646 - 05/04/08 07:56 PM (15 years, 10 months ago)

This is my first post here.
Matter of fact, I signed up just so I could help you out.
Yes! Your design will work.
The plenum on my flowhood is EXACTLY 7cm.
I am using a direct drive blower with a 1/4 hp motor to push air through a 50in. x 30in HEPA filter and it works perfectly.
Use design #1 as it will work fine.
Your drawings are confusing because they show the HEPA filter where the plenum is actuall located.
Fan is located in the upper blower housing located above the work surface....correct?

Here is the a link where I borrowed my design from. I think you are proposing to do the same. Scroll to the middle of the page for a working drawing.

http://www.aircleansystems.com/process_horizontal.htm

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