wilvon
May 9, 2008, 06:04 AM
Why does my unit (attic) pop when it shuts off?
wmproop
May 9, 2008, 07:05 AM
Does it sound like sheetmetel popping? Does it do it when the fan shuts down or when the burners go out? Woops,didn`t ask,is it a gas furnace?, next question,is are you sure the filter is clean and not obstructing the air flow