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Offlineclueless
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Flow hood number confusion.
    #19367512 - 01/04/14 10:23 AM (10 years, 1 month ago)

I am looking into building a flow hood and am a bit confused.

As I understand it I need to have a velocity of 100 cfm out the front of the filter.

Since I am looking at a 2x2 should it have 400 cfm flow?
The data sheet shows a velocity of 175 fpm delivered at 1 in w.g.
Should I shoot for 600 cfm at 1 in w.g. to match the filters flow rate or 400 to keep a slower speed leaving the filter?

Here's a link to the filter http://www.filtera-b2b.com/businessfilters/hepa.htm.
It's the 99.97% regular, not the high efficiency one.
the data sheet link is on that page for anyone who needs more #'s.

Just super confused here and don't want to buy the wrong stuff.
Thanks everyone.


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I'm a rhinestone tiger in a leisure suit.


Edited by clueless (01/04/14 10:28 AM)


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Offlinemonoculture
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Re: Flow hood number confusion. [Re: clueless]
    #19367638 - 01/04/14 11:09 AM (10 years, 1 month ago)

You need 0.5m/sec airflow from the filter.
I wanted to follow THIS post to construct one, but while referring to it to answer someones question, RR REPLIED that the post is not entirely correct. I just bought a ready made LFH after that.

When I'm holding a lighter in front of the flowhood, the flame will be horizontal, but the flame is not blown out.
You can also get yourself a over sized centrifugal fan with a fan-controller and trim the LFH using a lighter to give the same result as mine, which works flawlessly till now.


Edited by monoculture (01/04/14 11:20 AM)


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Offlineclueless
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Re: Flow hood number confusion. [Re: monoculture]
    #19372598 - 01/05/14 12:06 PM (10 years, 1 month ago)

I uderstand how to hold a lighter in front of it to test flow.
I am not sure about the numbers to search for and just don't want to build an overpriced aircleaner.
Do I need to produce 600 cfm and trim the speed back?
Would this filter even work since it shows a working speed of a higher number?
At 175 fpm at an initial resistance of 1" wg does that mean no flow under 1"?


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Offlineclueless
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Re: Flow hood number confusion. [Re: clueless]
    #19378476 - 01/06/14 06:10 PM (10 years, 1 month ago)

Come on, no one really?
I just need some answers to steer me in the right direction. :rolleyes:


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Re: Flow hood number confusion. [Re: clueless]
    #19381203 - 01/07/14 07:35 AM (10 years, 1 month ago)

I don't have the perfect answer because I bought a ready to use product in the end, but I can give you the specs of the parts of my flowhood.

H14 HEPA Filter (99.995% 0.3 micron) 610x484x90mm 160 +/- 15 Pa

Centrifugal Fan: 840 m3/h

So now let's take that info and apply it to the post I mentioned:
I will use the metric system because that is what the specs come with and which is what I'm used to, but it will work with feet, rogs or hogsheads the same. :wink:

1. Find out the area of your filter by multiplying the width and the hight in feet meters
0.61x0.484=0.29524 m2

2. Multiply the required air speed(the one Stamets specifies) with the area of your filter
required air speed is 0.5 m/sec, which is 30m per minute

0.29524x30=8.8572 m3/min

60x8.8572=531 m3/hour

I do not have the chart of the blower, but when looking at the chart that's supplied with the example:



When we take line 3 and let that represent the blower in my hood, which is a little more than 800m3/h, but I'm using a prefilter that should take it more to 800m3, we see at 160pa it will give a little more than 500 m3/h, which is exactly right.

Conclusion is my flowhood is calculated based on the calculation of the post I was referring to and is working as should, so I would use that to do the calculation if I were you.

About the HEPA filter you mentioned, I see now it is 99.97% instead of 99.995, which does not make it a H14, but H13 spec.
Most bacteria and mold are bigger than 0,3 micron, even 10 times bigger, but it only specifies to keep 99.97% of the particles bigger than 0.3 micron from passing, not how big the biggest particle that can pass will be.
You might get away with it, but I would like to be sure.
Even in outdoor countryside air, away from factories,
air contains approx 108 particles per m3.
And while working behind mine, 530 m3 passes the filter within a hour of work.


Edited by monoculture (01/07/14 07:39 AM)


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