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OfflineJeff Vader
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Registered: 08/08/14
Posts: 427
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HEPA filter selection
    #21731567 - 05/28/15 08:05 AM (8 years, 8 months ago)

I am having an issue locating "old" 6" style HEPA filters in my country. All the airflow design's I have found are built around the 6" filter.

The H14 I am considering using:
http://www.tfw.co.za/files/flat_panel_hepa_filter.pdf

A post from RR:

Quote:

RR Note:
Some of the newer HEPA filters flow higher than we want at 1" of
static pressure. In these cases, you need to run at a lower static
pressure, because you really don't want more than 100 feet per minute
leaving your hood.

Based on the specs above, I'd go with the 6" deep filter because it
has higher resistance. The resistance is what helps achieve laminar
flow by creating pressure on the back side of the filter. If every
inch of the back side is under pressure, the air flows smoothly out
the front side.

I'd go with the 6" filter and a blower rated at 450 cfm @ 1" W.G.




Has anybody has luck designing a flow hood with 2.5" deep filter? Air pressure adjustments on the blower etc etc.

If not let me know what brand and models you use successfully, I will see if I can source the same locally.


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Invisibleblindingleaf
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Registered: 07/19/13
Posts: 22,008
Loc: sub-surface unseen
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Re: HEPA filter selection [Re: Jeff Vader]
    #21732108 - 05/28/15 11:03 AM (8 years, 8 months ago)

its ok to have more than 100cfm coming off the face of ur filter.

laminar flow is not a specific CFM.  laminar flow means that the CFM across the board is equal at all points.  in this case, it is the face of a filter.

if ur blower pushes out 300cfm off the face of ur filter, that is still laminar flow, and will be as effective as 100cfm for growing mushrooms at home.
when u start getting much higher, maybe above 500 cfm, is when you would need to get worried, because the speed of that air hitting ur hands, tools, and plates/jars/etc, could cause enough turbulence to blow lingering contaminant spores into ur work.

u can also buy a speed adjuster and lower your blower strength until you see the lighter test bend 45-90 degrees.

im not sure about filter thicknesses less than 5-6", but i think there was a dude who did it a few months back.  not sure on his posting name.

have u searched for 12"?  they are usually cheaper and more available, and there a few hood threads where they were used.  i think Total and Damion 5050 both used 12"


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