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Old 11-17-2011, 05:39 PM   #1
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Checking balance of duct system


We seem to be getting more air (and noise) out of registers close to air handler. I want to check flows from each register. I have an anemometer.

Problem is that register don't distribute flow across their faces. It blasts through wherever the boot inlet comes in, so I get a very high flow in one place and very low or zero in other places.

I am thinking of removing all registers and measuring flow right where duct enters boot. Does this make sense?

PS: this is an attic mounted air handler (heat pump)

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Old 11-17-2011, 05:45 PM   #2
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Checking balance of duct system


A anemometer is fine, but like you said the face velocity of the registers makes it difficult to get a valid reading.

You could always use a ribbon on a stick, look at the average angle the ribbon is blown and adjust your ducts to try and achieve a consistant look.

Mark

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