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Offlineshroombab
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please check out this hepa....is it laminar flow quality?
    #12583280 - 05/18/10 01:10 AM (14 years, 8 months ago)

Its hard to tell from the description and googling the model number doesn't bring up much more info.

Can anyone vouch that this is a laminar quality hepa filter?

http://cgi.ebay.ca/NEW-99-97-HEPA-FILTER-SERIES-M97MG202612-/220602505333

thanks!

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Offlinejingus

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Re: please check out this hepa....is it laminar flow quality? [Re: shroombab]
    #12583321 - 05/18/10 01:20 AM (14 years, 8 months ago)

HEPA is HEPA, right?


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OfflineRandomstickynote
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Re: please check out this hepa....is it laminar flow quality? [Re: jingus]
    #12583381 - 05/18/10 01:41 AM (14 years, 7 months ago)

99.97% efficient as opposed to 99.99%

Dunno if it's completely unsuitable (can't imagine it'd be too bad) but I'd personally go for the most efficient you possibly can.


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OfflineRogerRabbitM
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Re: please check out this hepa....is it laminar flow quality? [Re: jingus]
    #12583945 - 05/18/10 06:36 AM (14 years, 7 months ago)

Quote:

jingus said:
HEPA is HEPA, right?




No.

However, the one linked to above is.  It's 11 inches thick.
RR


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Offlineshroombab
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Re: please check out this hepa....is it laminar flow quality? [Re: shroombab]
    #12585361 - 05/18/10 12:27 PM (14 years, 7 months ago)

Thanks RR.

To Jingus - this is why a HEPA is not just a HEPA - there are tons of filters that say "HEPA" and of the variety that filter microbes (as opposed to particles) there are at least 3-4 kinds, and different levels.

Which leads me to my next question....working out the blower speed.

I am having a really hard time with these calculations but here goes, using the following worksheet http://www.fungifun.org/English/Flowhood:


20" x 26.5" = 530"(2squared) - Surface AREA of filter
1200"/m (air speed in inches) x 530"(2squared) = 636,000" (3cubed)

so 636,000"(3cubed) per minute is what my blower should deliver?
to work it out in feet, 12 x 12 x 12 = 1728 cubic inches per cubic foot

so 636,000 \ 1728 = 368 CFM


The part where I get confused is working out static pressure (does that come from the blower or the filter?) and then factoring in the pre-filter etc. Also howcome it doesn't factor in the depth of the filter?

The filter quality control sticker says tested flow - 1000 CFM
and then rated cap - 1000. I don't know what all the other numbers mean.

Someone help! I'm trying my best to do this by myself and getting confused...

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Offlineshroombab
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Re: please check out this hepa....is it laminar flow quality? [Re: shroombab]
    #12587348 - 05/18/10 05:12 PM (14 years, 7 months ago)

So I have my 20  x 26.5 x 11.5 inch HEPA filter...

will this 449 CFM blower be right for it? http://www.plantlightinghydroponics.com/vortex-inch-449-cfm-high-power-inline-fan-p-353.html

there is a 600 odd CFM model above that one too.

I am completely confused about the plenum part - how close it's supposed to go to the hepa, and what kind of filter can be used. I've scoured all the teks and forum for this info, and must just be missing it....

Thanks everyone!

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OfflineRogerRabbitM
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Re: please check out this hepa....is it laminar flow quality? [Re: shroombab]
    #12587491 - 05/18/10 05:34 PM (14 years, 7 months ago)

You're going to want a blower that delivers around 500 to 600 cfm at 1" static pressure.
RR


--------------------
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semper in excretia sumus solim profundum variat

"I've never had a failed experiment.  I've only discovered 10,000 methods which do not work."
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