Project details
Skill
Cost
Estimated Time
In this video, Ask This Old House plumbing and heating expert Richard Trethewey shows an innovative new way to seal ducts from the inside.
Steps:
1. Remove the grilles from all of the supply and return registers.
2. Plug each duct register with foam rubber and wide strips of tape.
3. Pressurize the duct system with a blower fan.
4. Use a computer to analyze the data to determine the amount of air leaking from the ducts.
5. Use the blower fan to mist the inside of all the dust with liquid-rubber sealant.
6. The sealant will find and plug all air-leaking holes, cracks, and seams.
7. After applying the sealant, run another pressurized blower test to verify the improved results.
