Apprentice Q&A · #209

What should I check before grease duct fire wrap gets covered?

3rd YearGrease DuctRED · Stop / Verify

Stop if grease duct, wrap, framing, or clearance does not match the listed assembly. Verify the exact wrap system, layers, overlaps, bands, penetrations, and combustible clearance per manufacturer/ESR/project/AHJ direction.

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Plain-English answer

Grease duct fire wrap is only as good as the listed assembly it follows. Being close to wood framing or other combustibles does not automatically become okay because someone wrapped the duct.

The field move is to stop and verify the actual wrap system and approved detail: product, layers, overlaps, bands, terminations, penetrations, support interruptions, access doors, and surface prep. If it does not match the listing/submittal, hold it before cover.

Field checklist

Identify the wrap product and approved project detail/submittal.
Check number of layers, overlap direction, banding/fastening, seams, corners, access doors, and penetrations.
Look for compressed wrap, gaps, tears, oil/dust on the duct, or missing treatment at supports.
Confirm combustible clearance/zero-clearance claim only against the listed assembly and AHJ/project approval.
Photograph the run before it is hidden by walls or ceiling.

Ask Foreman

The grease duct wrap at [location] is close to combustible framing and I need to verify the listed assembly. I checked the product/detail and see [gap/overlap/layer/access issue]. Do you want this held for inspection or corrected before cover?

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Verify before acting

Use this as training guidance. The foreman, approved drawings, project specs, manufacturer installation instructions, employer safety policy, and AHJ/code requirements always control the final answer.

What should I check before grease duct fire wrap gets covered?

Plain-English answer

Field checklist

Ask Foreman

Verify before acting

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