Ok... on a bathroom vent (fan vent, not DWV) there is a "flapper" built into the exhaust vent. It is meant to keep closed when air blows into it from outside and open when air blows into it from inside.
Because of high winds, the dam thing is constantly heard banging away... I have triple checked that it IS installed correctly.
What gives?
Thanks,
Pete
Because of high winds, the dam thing is constantly heard banging away... I have triple checked that it IS installed correctly.
What gives?
Thanks,
Pete