I had a customer e-mail me about a loud constant noise(banging)coming from his ductwork over the furnace and in the master bed and bath. It’s only when the fan is on and has become worse since the utility company replaced the fan motor. The noise stops when the fan shuts off! IMO it sounds like a imbalance/restriced air flow or loose ductwork that may need strapping. Any ideas would be helpful or maybe someone has has this situation happen before.
Thanks in advance!