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Old 10-12-2010, 06:08 PM   #1
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20 degree difference from 1 duct to another


Hello all, I have noticed that the air temp in one of my main trunk lines is 115f and the other is 135f I have tried manipulating registers but can not get it to balance out. I'm looking for any suggestions? It is a forced hot air furnace 113k BTU basement/upflow model about 1 year old. The hotter of the 2 ducts is on the side of the plenum and the cooler is on the front of the plenum (opposite the blower) both are 8" x 16" trunk lines and have offset takeoffs, although the takeoff on the hotter duct has a larger inlet apprx. 12"x16" as opposed to apprx 10" x 16" on the cooler duct (not sure if that matters but I figured I would give as much info as possible). Again any input would be greatly appreciated.

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Old 10-13-2010, 04:00 AM   #2
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20 degree difference from 1 duct to another


sounds like you have a turbulence air issue or just a poorly designed plenum.

I have seen a lot of this in the field where two trunks coming off a common trunk.

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Old 10-13-2010, 04:13 AM   #3
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20 degree difference from 1 duct to another


Take a pic and post it.

As above, could be turbulence.
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Old 10-13-2010, 04:21 AM   #4
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20 degree difference from 1 duct to another


See, not bad for an NCI non grad.

Have yet to see common tapped plenums work well
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