Quote:
Originally Posted by happy camper x2
Chasers
We had the same problem with are new HC 353 RL. Unfortunately this is a common problem with the whisper quite system.There are a ton of threads dealing with the fixes. I took it back to the dealer and finally got it fixed through the warranty process. They re taped the plenum box, added two more return vents, added two additional drops and added the the 1 1/2 pvc pipe.
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Where were the 2 return vents added? 1 in each unit or 2 in each unit???
Pics or drawing???