Internal hood joints and seams and appurtenances shall be

• A. Sealed greasetight
• B. Left unsealed
• C. Made of plastic
• D. Painted

Answer: (A)

In a commercial kitchen exhaust system, keeping joints, seams, and appurtenances grease-tight is essential. Grease is highly flammable, and if joints aren’t sealed, grease can seep into ductwork and concealed spaces, creating fuel for a fire and potentially obstructing the path of the extinguishing agent. A grease-tight seal helps contain any grease within the intended spaces, supports easier cleaning and inspection, and maintains the effectiveness of the fire suppression system by reducing hidden fuel sources and obstructions. Options that leave joints unsealed would allow grease leakage; using plastic components isn’t appropriate for heat and grease exposure, and painting does not prevent grease leakage or fire risk.