I recently acquired a used furnace bower that I want to install in my wood workshop as an air filter. When I tried out the blower on the bench I found an baffling observation.<!—-> <!—-><!—->
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The blower is on the workbench with no ducting on the inlet or outlet. I put three furnace filters on one side of the inlet. If I restrict the output, the blower speed and airflow increases. I can see that there is actually more air flow because I can see the filters compress when I restrict the outlet.<!—-><!—->
What’s going on?
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VENTURI EFFECT. OR IS IT BERNOULLI? why am I typing in caps? dang capslock was on!
"Put your creed in your deed." Emerson
"When asked if you can do something, tell'em "Why certainly I can", then get busy and find a way to do it." T. Roosevelt
" Cavitation " .?Remodeling Contractor just on the other side of the Glass City
I thought cavitation was turbulence, and that's what eats away boat propelleors ... ?"Put your creed in your deed." Emerson
"When asked if you can do something, tell'em "Why certainly I can", then get busy and find a way to do it." T. Roosevelt
that's what gets yur submarine sunk...
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming<!----><!----><!---->
WOW!!! What a Ride!Forget the primal scream, just ROAR!!!
Google on "fan curve"
There are 2 stable operating points for any fan or blower and duct system, depending on fan construction and speed and ducting resistance to air flow. You are on the RH side of the curve.
Forgot, welcome to BT, see this is your first post.
Edited 11/20/2007 11:44 pm ET by junkhound
Well, I looked at some fan curves and they all seems to say that as outlet pressure decreases air flow increases. I didn't see anything about not enough resistance. Anyway I should have some resistance when I mount this thing in a box. If not I can add some.
That leads to the real questions? What air filters could I use. Furnace filters don't don't say what the absolute micron rating is. If I can get something in the 1-3 micron range tht would be great.