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I don't think it's a matter of he motor getting tired. If anything it's an issue within the ECM that senses the system static pressure and adjusts the speed accordingly. I just think your duct sizing, on both supply and return, is so out of whack that the system can't compensate. This is why I've asked for the number of supply registers and corresponding sizes. I'd be interested in knowing what size the main trunk is that feeds the supply registers as well. So much goes into proper duct sizing and from the looks of things, the original installer had no clue what they were doing.
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Nick
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