How to Seal Leaky Ductwork

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Richard Trethewey shows an innovative new way to seal ducts from the inside. (See below for steps.)\r
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Steps for How to Seal Leaky Ductwork:\r
1. Remove the grilles from all of the supply and return registers.\r
2. Plug each duct register with foam rubber and wide strips of tape.\r
3. Pressurize the duct system with a blower fan.\r
4. Use a computer to analyze the data to determine the amount of air leaking from the ducts.\r
5. Use the blower fan to mist the inside of all the dust with liquid-rubber sealant.\r
6. The sealant will find and plug all air-leaking holes, cracks, and seams.\r
7. After applying the sealant, run another pressurized blower test to verify the improved results.\r
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