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OfflineShroomNoob03
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Flowhood Questions- Matching filters and blowers
    #5702048 - 06/01/06 11:20 PM (17 years, 7 months ago)

Flow-hood Questions- Matching filters and blowers

When choosing a HEPA filter, does its depth matter? Height & Width determine the area of the filter. Does depth have any bearing on one's choice of blower?

What does one look for in a Pre-filter? Do certain pre-filters vary in Pa(0-50 Pascal?)? What is the standard Pa of furnace filters?

Thanks,
ShroomNoob03


--------------------
In science it often happens that scientists say, 'You know that's a really good argument; my position is mistaken,' and then they would actually change their minds and you never hear that old view from them again. They really do it. It doesn't happen as often as it should, because scientists are human and change is sometimes painful. But it happens every day. I cannot recall the last time something like that happened in politics or religion.

-Carl Sagan


Edited by ShroomNoob03 (06/02/06 01:55 AM)


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OfflineRogerRabbitM
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Re: Flowhood Questions- Matching filters and blowers [Re: ShroomNoob03]
    #5702704 - 06/02/06 02:08 AM (17 years, 7 months ago)

Consider a prefilter mandatory. I use a super allergen type furnace filter simply duct taped over the intake of the squirrel cage fan. You can disregard the impedence of the prefilter.

Be sure to get a laminar flow hepa filter. They're usually made from ceramic and aluminum. As a rule of thumb, you can just figure on 1" of static pressure being standard. Some filters are rated .9 and others might be as high as 1.3 or so. In the US, most squirrel cage blowers with a CFM rating have it based on that 1" of static pressure. Because of that, just disregard static pressure and look at cfm.(I can feel anno squirming as I say that...lol) You want between 100 and 150 linear feet per minute passing over your work space. So, a two square foot filter would need between a 200 and 300 cfm blower to deliver that velocity. Don't forget to build a plenum behind the filter for the fan to pressurize to the 1" of static pressure. The static pressure on the back side of the filter is how we get the even flow out the front to our work area.
RR


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OfflineShroomNoob03
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Re: Flowhood Questions- Matching filters and blowers [Re: RogerRabbit]
    #5706008 - 06/02/06 11:33 PM (17 years, 7 months ago)

Quote:

RogerRabbit said:
Consider a prefilter mandatory. I use a super allergen type furnace filter simply duct taped over the intake of the squirrel cage fan. You can disregard the impedence of the prefilter.

Be sure to get a laminar flow hepa filter. They're usually made from ceramic and aluminum. As a rule of thumb, you can just figure on 1" of static pressure being standard. Some filters are rated .9 and others might be as high as 1.3 or so. In the US, most squirrel cage blowers with a CFM rating have it based on that 1" of static pressure. Because of that, just disregard static pressure and look at cfm.(I can feel anno squirming as I say that...lol) You want between 100 and 150 linear feet per minute passing over your work space. So, a two square foot filter would need between a 200 and 300 cfm blower to deliver that velocity. Don't forget to build a plenum behind the filter for the fan to pressurize to the 1" of static pressure. The static pressure on the back side of the filter is how we get the even flow out the front to our work area.
RR




You said to use a laminar flow HEPA filter and I figured a 1ft x 2ft filter would provide me with a nice sized work area. I’ve seen filters online that are a foot high and two feet wide, which is perfect, but some filters are 5 1/2in. deep, and others are 11 1/2in. in depth. Does filter depth have any bearing on blower choice?

What exactly is a “plenum,” and how do I build one?

Thanks for the reply,
ShroomNoob03


--------------------
In science it often happens that scientists say, 'You know that's a really good argument; my position is mistaken,' and then they would actually change their minds and you never hear that old view from them again. They really do it. It doesn't happen as often as it should, because scientists are human and change is sometimes painful. But it happens every day. I cannot recall the last time something like that happened in politics or religion.

-Carl Sagan


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InvisibleBrainiac
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Registered: 04/29/06
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Re: Flowhood Questions- Matching filters and blowers [Re: ShroomNoob03]
    #5706685 - 06/03/06 03:57 AM (17 years, 7 months ago)

How about an Vortex PowerFan, an Inlane fan that rates at 747cfm for a hepa filter thats 24"H-24"L-5" at 4sf=400cf so an fan thats rated at 747 would work out.
Would this work out?


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:cool: Fair is Fair :devil:


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