Duct Leakage Class Requirements

For this duct system, what leakage class and seal class are specified? What sealant type and coverage does that require?

I'm checking duct leakage class requirements at [location]. I found specification or drawing note showing leakage class (e.g., Seal Class A, Leakage Class 3). For this duct system, what leakage class and seal class are specified? What sealant type and coverage does that require?

Sealing, Leakage, Mastic & Pressure Testing 2nd Year YELLOW

Stop if

Hold point on duct leakage class requirements: I have the location, photo, drawing/detail, and what was checked. Who should verify before this gets cut, covered, lifted, sealed, energized, or signed off?

Watch out

Don't assume all duct gets same sealant. Don't skip sealant on high-pressure duct. Don't over-apply sealant on low-pressure duct.

Check

room/grid/area
photo of condition
drawing/detail
manufacturer/model if visible
what I already checked

Say this to your foreman

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