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Shop: PhytoExtractum Maeng Da Thai Kratom Leaf Powder   Amazon HEPA Filter, Laminar Flow Hood

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OfflineFunGuy77
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flow hood construction
    #24403630 - 06/13/17 10:52 PM (3 years, 10 months ago)

Hey guys I`m a newbe to this site I dont even know if I`m doing the right thing here,but lets give it a shot.
So I made a SAB and after several months I`m fed up with it, though i havent got contamination,its just to small and to messy.
So I decided I`m gonna make a flow hood,I purchased a HEPA filter 24x36x5.88 and specs for this particular filter are as goes.

539CFM @ 0.29 +/- 0.5wg.

I`m trying to size up a fan for this particular filter but I`m having hard time
figuring out what fan to get or how many CFMs needed to establish laminar flow of 100 fpm .Please HELP anyone with some Knowledge on sizing filter to fan it will be very much appreciated.Thank-you guys.


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Offlinepi_cubed
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Re: flow hood construction [Re: FunGuy77]
    #24403728 - 06/13/17 11:38 PM (3 years, 10 months ago)

Try looking at this thread:
c10's Flow Hood Build

He has a section in there with the math.

or here:

Damion5050's Flow Hood Build

Here's another thread that goes through some of the math and matching components:

flow hoods matching blower with filter is this right?


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InvisiblebodhisattaM
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Re: flow hood construction [Re: pi_cubed] * 1
    #24405304 - 06/14/17 03:21 PM (3 years, 10 months ago)

A 24*36 filter is 2x3 which is 6 square feet so you need 600cubic feet per minute from your blower at the static pressure listed on the filter.

The blower spec sheet will say how many cfm it pushes at a given resistance (measured in inches water gauge)

Filters have static pressure. Static meaning the resistance doesn't change the filter always has X resistance

Usually a HEPA filter for laminar flow has a resistance of 0.8-1.0 inch wg. So you would need a blower that does 600cfm at 0.8-1.0" resistance unless the filter has a different resistance than 0.8-1.0


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OfflineFunGuy77
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Re: flow hood construction [Re: bodhisatta]
    #24406005 - 06/14/17 07:49 PM (3 years, 10 months ago)

Thanks bud hope this helps me out,it's just the rating of this filter that's freaking me out :shocked: 539cfm @ 0.29'' +/-0.5''wg what's that + or - for?\
What's my static pressure is it 0.29wg or 0.79wg after adding 0.5
not only that I have to add my pre filter to.So i don't want to get the wrong size blower cause they don't come cheap.
Thanks again and hope to get some more info from you soon.:thumbup:


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InvisiblebodhisattaM
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Re: flow hood construction [Re: FunGuy77] * 1
    #24406036 - 06/14/17 07:59 PM (3 years, 10 months ago)

Not what you want to hear but I would not have bought a filter with goofy specs like that

It means they test their filters at 539 cfm
Their quality control is so bad some of them tested at
0.29 plus or minus 0.5 so they're all over the place

You wont get laminar flow with a filter that has such a low resistance to achieve laminar flow look for a filter with 0.8-1.2 inches of resistance

With such low resistance you'll never build up the needed pressure in the plenium and won't get laminar flow out the front.

The filter you bought is for furnaces or hospitals not flowhood


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OfflineFunGuy77
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Re: flow hood construction [Re: bodhisatta]
    #24408428 - 06/15/17 07:24 PM (3 years, 10 months ago)

ok thanks a lot.:frown: so guess this means I have to return my filter and start my search over again.I will keep you posted on my progress,might be a while.Once again I thank you very much for your help,till next time.:thumbup:


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Shop: PhytoExtractum Maeng Da Thai Kratom Leaf Powder   Amazon HEPA Filter, Laminar Flow Hood

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