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post #41 of 44 Old 03-16-2014, 11:39 AM
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Common sense tell me it will.

Bob making sawdust in SW Louisiana
with a EX-21
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post #42 of 44 Old 03-16-2014, 08:43 PM
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That would be why I asked the question, hoping to get an education from a knowledgeable person. Our common sense gets us a long way in life, but there comes a point we have to ask for HELP............
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post #43 of 44 Old 03-17-2014, 11:40 AM
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An exhaust the same size is adequate. The intake size needs to be adequate to not "starve" the blower.
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post #44 of 44 Old 03-17-2014, 12:32 PM Thread Starter
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Originally Posted by cey146 View Post
Great job!

I've chosen to build one of these, similar to yours. I have a smaller squirrel cage fan/motor, with 4 speeds. I've adjusted my intake size down, to accommodate a 16" x 20" filter. A thought came to mind about the ratio of intake air/exhaust air. In the furnace industry, I think I can remember a Technician advising me of the phrase: Same in, same out. Indicating the return air size should equal the sq. in. volume of the supply air. I'm wondering if that would hold true in this application, or if the exhaust the same size of the blower chute is adequate. (as seen on nearly all of these)

Any input on this would be appreciated. Thanks.
I'm not an HVAC guy, but as I understand it the motor will take what it needs provide the intake is available. The intake therefore must be the same size or larger. I used the 20x20 intake because that was the closest standard size that would fit my motor.
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