Duct testing can be preformed
Duct testing & Blower Door can be preformed
A blower door is a powerful fan that mounts into the frame of an exterior door. The fan pulls air out of the house, lowering the air pressure inside. The higher outside air pressure then flows in through all unsealed cracks and openings.
These are some reasons for establishing the proper building tightness:
Two types of tests are performed: total duct leakage and leakage to the outdoors: