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When Pat went down into his crawl space to see if he could improve his duct sealing and reduce leakage, he found that the duct joints were sealed with duct tape that had long since become brittle and ineffective.
He also found the duct in the picture below -- a duct cap that had completely opened up due to a failure of the tape holding the cap in place. Amazing!
Check your ducts! Seal all the joints with duct mastic -- insulate any ducts that are not insulated.
Gary Mar 14, 2008