"A thorough sealing of the duct system, including the furnace cabinet should do a lot to remove pressure differences from the air handler. Radon issues aside, there are a number of reasons to avoid basement returns."
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Combustion Appliance Zone Testing (CAZ) Made Easy (March 24, 2016)
-Adapting to the new BPI standard
-RESNET testing requirements
-NFPA testing requirements
-Best practices for best results