Under what conditions am I allowed to use flex duct in a commercial kitchen?

Almost never. You are explicitly prohibited from using flexible air duct runs inside any commercial kitchen extraction system handling hazardous grease-laden or moisture-laden vapors (Type 1 or Type 2 hood lines). The exhaust air must travel through continuous, heavy-gauge, smooth rigid metal ductwork to prevent grease traps and allow structural fire protection wrap containment.

[' Almost never. You are explicitly prohibited from using flexible air duct runs inside any commercial kitchen extraction system handling hazardous grease-laden or moisture-laden vapors (Type 1 or Type 2 hood lines). The exhaust air must travel through continuous, heavy-gauge, smooth rigid metal ductwork to prevent grease traps and allow structural fire protection wrap containment.']

Stop if

• 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.

Check

• Almost never. You are explicitly prohibited from using flexible air duct runs inside any commercial kitchen extraction system handling hazardous grease-laden or moisture-laden vapors (Type 1 or Type 2 hood lines). The exhaust air must travel through contin

Steps

• Stop and verify the approved detail, manufacturer instructions, foreman direction, and project specs before touching it.
• Almost never. You are explicitly prohibited from using flexible air duct runs inside any commercial kitchen extraction system handling hazardous grease-laden or moisture-laden vapors...

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