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What items will have a shortened service life? If there is less airflow will the heat exchanger be affected? Maybe it would retain too much heat. More load on the fan motor? What is the theory of operation? I thought it was more like the blower creating a vacumm in the return duct...

For various reasons I want to relocate my air filter to a vertical duct. Rather than perpendicular to the airflow it will be 21° from parallel. Has anyone done this successfully? Here's a diagram of what I'm considering. Anyone have any thoughts on this? Thanks

Anyone have any comments on what happens when the ridge vent is covered with snow? Will having a gable vent help?

if the return duct is attached to the bottom and not the sides that is where the filter goes.

fyi. lowes and home depot both sell owens corning attic cat blown-in fiberglass here in n.e. ohio. AttiCat Blown-In Insulation System

moggy, do you have hvac duct work in your attic? i added a forced air system to my house with the ducts in the attic space and have had ice dam problems ever since. i'm now planning on covering the duct work with more insulation.