My flow hood
Posted: Sun Jun 07, 2009 4:33 pm
I know, its weird but it's completely functional. The design is mine and it came about from the materials I already had available. Haven't put the hepa filter in yet.
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Matt wrote:WOW! That's awesome and it looks relatively inexpensive to make. I really like it. I can tell you definitely have some ingenuity!Well, the HEPA filter I bought from Menard's. I don't know if you have them where you are but it's similar to Lowe's or Home Depot. The brand is HEPAtech and its a replacement for an air purifier. It says it catches particles 99.97% effectively @ 0.1 microns. Cost $20-$25! I thought most HEPA filters were expensive and where rated @ 0.3 microns?
What did you end up using for the HEPA filter and where did you get it?
renesis wrote:Wow, very creative! Awesome to see some more people joining in on TC lately!Thanks a lot! I took into consideration what you mentioned about the rating and air speed for the filter. The blower is a monster of an air mover so I constricted the airflow @ the output to 3in then transitioned to 6in. Thus, less speed and pressure. Just enough to go through the filter and purge the work area, assuming that the problem would be with too much air going through it. Hope it works out!
The only thing you have to be careful about on the HEPAs is what air speed they are rated (and tested at). If you put more air speed through it than what it was designed and tested for, the efficiency might go down.
Is the hood on top the pre-filter?
Matt wrote:it looks relatively inexpensiveAnother way of saying "Cheap"??
WORMSS wrote:Yes, applying constriction on any duct using a blower(not a flat blade fan) will cause the motor to reduce RPMs. But, the blower I'm using is designed for furnace exhaust and is pretty tough. I can get away with about 5/10 of static pressure bogging it down and it won't hurt it a bit. The reason I can't have a relief valve is because although the cfm's would be the same, the static pressure wouldn't be and the pressure is what moves the air through the filter. Not cfm's. With constriction, you 1. reduce rpm's of the motor 2. thus reducing the cfm output of the blower and then pressure:)
Squeezing the pipe to slow the air would just put more Strain on the air pump wouldn't it???
could always do something like a Y shape, one 1 half have the air filtered, the other half have a valve.. so some of the air being pushed is allowed to escape and so slows the air going through the filter???
WORMSS wrote:I had a similar problem when constructing mine, but the correct way to do it is by constricting the inlet. Having a relief valve between the HEPA and blower may cause some turbulence. Restricting the inlet works fine as long as the motor has enough air to cool itself. Especially with the motor exposed, he should be fine with that setup.Matt wrote:it looks relatively inexpensiveAnother way of saying "Cheap"??
lol
Squeezing the pipe to slow the air would just put more Strain on the air pump wouldn't it???
could always do something like a Y shape, one 1 half have the air filtered, the other half have a valve.. so some of the air being pushed is allowed to escape and so slows the air going through the filter???