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InvisibleBuckthorn
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Registered: 07/25/08
Posts: 4,702
MERV
    #27811746 - 06/09/22 06:22 AM (2 years, 7 months ago)

I am inventing my first Flow Hood. I bought a HEPA filter and a muffin fan. The HEPA is not 0.2um though so it will not filter mold spores. I am entertaining buying a different HEPA or air filter that filters mold spores, what MERV rating is suggested/recommended?

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InvisibleNichrome
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Registered: 12/17/18
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Re: MERV [Re: Buckthorn]
    #27811881 - 06/09/22 08:24 AM (2 years, 7 months ago)

99.999% or at least 99.997% at .3 microns. The filter you bought will not work for mycology.


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OfflinePBJ710
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Re: MERV [Re: Nichrome] * 1
    #27811891 - 06/09/22 08:31 AM (2 years, 7 months ago)

HEPA 13/14 is what you are looking for but it has to be combined with an appropriate fan/chamber to produce laminar flow.  You'll be better off just using a properly made SAB if you can't build a FH with the appropriate gear.

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OfflineShroomoisseur
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Re: MERV [Re: PBJ710]
    #27811954 - 06/09/22 09:24 AM (2 years, 7 months ago)

I use H13 with Merv 8/G4 pre filter on intake

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InvisibleBuckthorn
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Re: MERV [Re: Shroomoisseur]
    #27820679 - 06/15/22 11:17 AM (2 years, 6 months ago)

Can you link me to a shop that sells filters?

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Offlinerumfor69
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Registered: 08/05/11
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Re: MERV [Re: Buckthorn]
    #27820853 - 06/15/22 02:11 PM (2 years, 6 months ago)

Goto terrauniversal.com and read about the filters they sell for fan filter units.
This will give you a good understanding of
what kind of filter mycology requires.

Building a flowhood requires a certain fan
for a certain filter resistance(static pressure)
and then a box that can build enough plenum
of air in it before that static pressure is
pushed through the filter evenly at once to
create true laminar flow.


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