How To Fix Leaks In Air Ducts
Steps: Tape over all the supply and return registers throughout the house. Attach a duct blaster fan to a section of flexible duct, then attach opposite end of flexible duct to existing heating duct. Use a pressure-and-flow gauge to determine air pressure in duct. Blow smoke into the heating duct using a theatrical fog machine; check for smoke leaking out of the duct. Hold a smoke pencil close to joints and seams in duct to determine if air is leaking out....