Essential Tips for Passing a Duct Blast Test

Complete testing at the Mechanical Rough-In Phase

The Mechanical Rough-in Stage is essential for conducting your duct blast test. Performing duct blast testing during the rough-in phase is 99% more effective than at the Mechanical Final Stage. This is because the ductwork is exposed, allowing you to easily identify leaks using a simple smoke test. Once the walls are closed, the chances of finding leaks within a sealed wall are extremely low. Conducting this test early is advantageous if your ducts will be concealed. If your ducts are located in an attic, keep in mind that attic insulation may obscure leaks that the tester might not detect.

Sealing

1. Seal your air handler correctly. https://youtu.be/vqE9jFPLrbs?si=IvQJtGrv4M-8101W

2. Make sure your vents are flush with the drywall. Or have a seal around them. https://youtu.be/Sf3DAjbosbo?si=prmcGW8Z9CZCWUqf

3. Tape and seal your vents connections with Mastic. https://youtu.be/aCCWAmESK4w?si=3psMEKAl5_21Wu4P

Insight

How is the test conducted?

https://youtu.be/X3C5t2AukWA?si=EcPZUfTvhvAkFS9t