raymie1
Feb 3, 2008, 12:18 PM
I have a fairly new house 2years old , the intake -exhaust from the furnace runs through the attic , through a 3" pvc concentric , everything works fine , however there is a "tapping"noice that comes from the concetric as the pipe heats up , its fairly loud because it echoes in the exhaust pipe , there is spray-foam insulation around the concentric as well as the attic rafters , any ideas ? Thanks