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haxjester
Jack's Friend



Registered: 09/18/06
Posts: 108
Loc: Down the street from Jack
Last seen: 11 years, 6 months
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Laminar Flow Hood Questions
#8020435 - 02/13/08 11:31 PM (15 years, 11 months ago) |
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I plan on making a laminar flow hood for Jack. I've done all the reading I can, but still cannot wrap my head around knowing exactly what strength fan to get, if 99.97% or 99.99% is that much of a difference for the hepa filter to use, or if the work area of the flow hood needs to be enclosed (like with a plexi top so you can see).
There are some decent deals on ebay right now for hepa filters. I will most likely end up getting a 24x24x6 99.97% or 99.99% filter.
This site here has deals on blowers, but I'm not sure which one I need.
99.97% or 99.99%? Which of those fans to get? Enclosed workspace or not?
Thanks in advance 
"To live fully is to let go and die with each passing moment, and to be reborn in each new one." -Jack
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GoodbyeOrb
Self-SacrificingPotency Tester


Registered: 04/09/07
Posts: 5,179
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Re: Laminar Flow Hood Questions [Re: haxjester]
#8028422 - 02/15/08 05:54 PM (15 years, 11 months ago) |
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As far as the fan CFM there is a whole thread around here somewhere with all the math in it, try using the search function.
Shouldn't be enclosed, a laminar flow hood works like an oven hood, not really an enclosed deal. You could combine a glove box and laminar flow deal, but you'd have to have a hepa input. Once you find that thread I was telling you about, it will tell you all about calculating actual CFM as relates to filter size and, using those calculations, you will be able to determine which hepa filter will work best for you. Good luck.
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FooMan



Registered: 02/02/05
Posts: 8,957
Loc: Earth
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Re: Laminar Flow Hood Questions [Re: haxjester]
#8028641 - 02/15/08 06:44 PM (15 years, 11 months ago) |
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Quick WBS Prep
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toomuchtv
Stranger

Registered: 09/29/07
Posts: 14
Last seen: 15 years, 6 months
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Re: Laminar Flow Hood Questions [Re: FooMan]
#8029460 - 02/15/08 10:13 PM (15 years, 11 months ago) |
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Get the 99.99, that is a real hepa filter. The 99.97 is "hepa-type". Hepa-type filters don't trap most molds and spore. These are the things that cause contamination.
Edited by toomuchtv (02/15/08 10:14 PM)
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xhooliganx
Munky


Registered: 03/09/06
Posts: 900
Loc: reno, nevada
Last seen: 2 years, 8 months
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Re: Laminar Flow Hood Questions [Re: toomuchtv]
#8029726 - 02/16/08 12:06 AM (15 years, 11 months ago) |
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Quote:
toomuchtv said: Get the 99.99, that is a real hepa filter. The 99.97 is "hepa-type". Hepa-type filters don't trap most molds and spore. These are the things that cause contamination.
um I have a true hepa filter that is rated at 99.97% .03 microns. it's not hepa type.
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haxjester
Jack's Friend



Registered: 09/18/06
Posts: 108
Loc: Down the street from Jack
Last seen: 11 years, 6 months
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Re: Laminar Flow Hood Questions [Re: xhooliganx]
#8031778 - 02/16/08 05:00 PM (15 years, 11 months ago) |
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I appreciate the input. I have used the search function, and been to fungifun, those are the base of my knowledge for building the flowhood.
But what if the static pressure of the filter is not known, and cannot be found, should I generalize and assume 1"? Also if there is no data sheet to be found for the blower? I know that's very general and useless when it comes to using the equation, it's basically a crapshoot. As an opinion would a 800cfm blower be good for 99.99%, 23.62" x 47.62" x 7.88" hepa filter? I would use the candle/lighter trick to determine if it's strong enough. Also if it is not, can a second blower be used parallel with the first blower to increase flow?
As for it being enclosed, I did not mean like a glovebox. I meant how some flowhoods have the surrounding around the output hepa with 4 walls, kinda extruded from the main box, with no front on it, like here, or like the one on fungifun where it is not present. Is there an advantage to either design?
Thanks again 
"Silver horses ran down moonbeams in your dark eyes. / Dawnlight smiles on you leaving, my contentment." -Jack
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FooMan



Registered: 02/02/05
Posts: 8,957
Loc: Earth
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Re: Laminar Flow Hood Questions [Re: haxjester]
#8031894 - 02/16/08 05:26 PM (15 years, 11 months ago) |
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Assuming the filter's static pressure was 1", and the blower blows at 800cfm at 300Pa, then the blower would be just about perfect for that size filter. If there is no possible way to find the static pressure of the filter, I would try the candle test and hope for the best. Good luck
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Quick WBS Prep
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