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Apprentice answer

Can standard spiral duct be used for commercial kitchen grease exhaust

3rd YearGrease Duct & Specialty ExhaustStop and get direction

No. Treat grease/liquid exhaust construction as a stop item. Standard spiral lockseam is not a field patch for grease service.

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Plain-English answer

Kitchen grease or liquid-bearing exhaust needs approved liquid-tight construction. Lockseam spiral can leak through the seam and create sanitation, fire, and inspection problems.

Stop the work, identify the system type, and verify the required listed/welded material, cleanouts, slope, wrap/clearance, and inspection detail before continuing.

Ask Foreman

This kitchen/dishwasher exhaust at [location] appears to be standard spiral lockseam and is leaking liquid/grease. I stopped work. Do you want this held for the approved grease-exhaust material/detail?

Verify before acting

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

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