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 RogerRabbit
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Registered: 03/26/03
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 Re: Laminar Flow Hood (w/ pic) [Re: makaveli8x8]
#7569077 - 10/28/07 08:08 AM (1 year, 2 months ago) |
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Do you have a good sized plenum behind the filter? That's key to laminar flow.
RR
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Ignorance is contagious. Boycott Walmart and watch your IQ go up.
RR
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makaveli8x8
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Re: Laminar Flow Hood (w/ pic) [Re: RogerRabbit]
#7571265 - 10/28/07 10:13 PM (1 year, 2 months ago) |
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shoot me...shoot me now.
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 ThePyschonaut52
Registered: 04/24/07
Posts: 982
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Re: Laminar Flow Hood (w/ pic) [Re: makaveli8x8]
#7571987 - 10/29/07 06:25 AM (1 year, 2 months ago) |
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 you forgot the plenum?! lol, damn
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makaveli8x8
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yah i was looking at them photo's on http://fungifun.org/flowhood/ and they don't have them in alot of the pictures 
edit: none of the pictures  , maybe when i get my blower all sealed up completly it will blow more even 
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We were sent to hell for eternity Øh®
We play on earth to pass the time
Over-population the root of all Evil-brings the Elites Closer to the gates.
Edited by makaveli8x8 (10/29/07 07:16 AM)
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legallyhomeless
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Re: Laminar Flow Hood (w/ pic) [Re: makaveli8x8]
#7572153 - 10/29/07 07:41 AM (1 year, 2 months ago) |
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Yeah I never understood thoes flowhoods on fungifun... sorry anno!
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orchidfanatic
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a plenum is just a box on the backside of the filter right ? I finally got my fan. its on the way .. whats wrong with the fungi pics?
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makaveli8x8
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its a divider between the filter and the fan, basicly a board with a whole in the middle of it. it redirects the air flow
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We play on earth to pass the time
Over-population the root of all Evil-brings the Elites Closer to the gates.
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orchidfanatic
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Re: Laminar Flow Hood (w/ pic) [Re: makaveli8x8]
#7586701 - 11/02/07 06:51 AM (1 year, 2 months ago) |
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ok so its a full board against the back of the filter but just off of it like several inches .. how big should the hole be? so the fan goes behind this board and pressurizes the space the blower sits in ..
that sends a steady stream into the middle of the hepa?
I thought a plate in the back of the filter with slots on the sides would make for more even flow into the hepa? I wish there was a pic of this .. I will try searching
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orchidfanatic
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RogerRabbit
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You don't need a board. The blower output should be at a right angle to the filter, not blowing directly on it.
A plenum is an air space behind the filter that is pressurized by air from the blower. Once the air is pressurized, it exerts the same amount of force on every square centimeter of the filter, thus giving laminar flow. If there is more pressure on part of the filter, that part will flow more, causing turbulence and eddy currents in your work area. The pleneum evens out the pressure, thus you get laminar flow.
RR
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www.mushroomvideos.com
Ignorance is contagious. Boycott Walmart and watch your IQ go up.
RR
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orchidfanatic
retiree
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Posts: 832
Loc: where the wild things are
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Re: Laminar Flow Hood (w/ pic) [Re: RogerRabbit]
#7586941 - 11/02/07 09:03 AM (1 year, 2 months ago) |
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Thanks Roger .. the blower I got is a high pressure blower 523 CFM @ 1" static pressure .. on a 2x2x11 hepa ..just waiting for shipping
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greysRDbest
Mushroom Dork
Registered: 07/16/06
Posts: 7,551
Loc: nunya
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shouldnt your output cfm from the filter be 200-400 cfm optimally?
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orchidfanatic
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Re: Laminar Flow Hood (w/ pic) [Re: greysRDbest]
#7587126 - 11/02/07 10:09 AM (1 year, 2 months ago) |
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RR said 400 CFM for my 2x2x11" filter ,but I will loose some due to prefilter so it should be just about right ..
I think its 100 linear ft/second is the standard
Edited by orchidfanatic (11/02/07 10:11 AM)
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em_bre_O
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yeah.....I built one out of the same filter size but i think the blower is slightly too strong.
sold my last 12"x24" fungiperfecti to a buddy but I get a brand new one today!
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orchidfanatic
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Re: Laminar Flow Hood (w/ pic) [Re: em_bre_O]
#7587291 - 11/02/07 10:55 AM (1 year, 2 months ago) |
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hhhmmmm I hope this one I got inst too strong .. but it was only 70 bucks and I looked it up 325 new what a deal
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Anno
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Re: Laminar Flow Hood (w/ pic) [Re: RogerRabbit]
#7587370 - 11/02/07 11:17 AM (1 year, 2 months ago) |
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Quote:
RogerRabbit said:
The blower output should be at a right angle to the filter, not blowing directly on it.
A plenum is an air space behind the filter that is pressurized by air from the blower. Once the air is pressurized, it exerts the same amount of force on every square centimeter of the filter, thus giving laminar flow.
What Roger said.
In the design at http://www.fungifun.org/English/Flowhood the blower sits in the plenum itself!
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Teragon
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Re: Laminar Flow Hood (w/ pic) [Re: Anno]
#7587668 - 11/02/07 12:34 PM (1 year, 2 months ago) |
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i  you, anno.
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orchidfanatic
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Re: Laminar Flow Hood (w/ pic) [Re: Anno]
#7587673 - 11/02/07 12:36 PM (1 year, 2 months ago) |
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yeah mines going inside the plenum blowing at a right angle to the filter
parallel to it ..
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RogerRabbit
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Your blower is fine for 4 square feet. A linear air speed of 90 feet per minute, to about 130 feet per minute, will be fine. In addition, there will be a bit of loss from friction, turns, etc., that will cut down on the flow. If you feel later that it's still blowing too hard, simply block off part of the intake to cut down the flow.
RR
--------------------
www.mushroomvideos.com
Ignorance is contagious. Boycott Walmart and watch your IQ go up.
RR
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makaveli8x8
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oh I couldn't figuer out how you could mount a blower without alot of space behind the filter, so thats why i thought the board with a hole in it was a plenum.
so my flowhood should be built right then, and my silicon should be cured today and ill try it out and see if it blows even now.
--------------------
We were sent to hell for eternity Øh®
We play on earth to pass the time
Over-population the root of all Evil-brings the Elites Closer to the gates.
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