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I added the pipe to the return ducts today...WOW!!! What a difference! I used 1" PVC pipe instead of the 1 1/4" pipe. The 1" couplings are about 1 1/4" in diameter and this is a little easier to push into the duct but it is held tight and will not move around. When I first removed the return vent cover and looked in there with a mirror, the inside of the duct was collapsed to the point that it was almost completely closed off through the entire length of it. Using cardboard ductwork is completely ridiculous, they should be metal ducts!
Jim, thanks for the tip on using the pipe as it doesn't block any airflow.
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