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Is a fire damper required to be installed in the supply duct collar of commercial kitchen hoods?

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Is a fire damper required to be installed in the supply duct collar of commercial kitchen hoods?

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The requirement of a fire actuated damper installed in the supply duct collar is based on how the hood is constructed. NFPA 96 states the following: 2-3.1 A fire-actuated damper shall be installed in the supply air plenum at each point where a supply air duct inlet or a supply air outlet penetrates the continuously welded shell of the assembly. The damper shall be listed for such use or be part of a listed exhaust hood with or without exhaust damper. The actuation device shall have a maximum temperature rating of 286*F (146*C). Supply air plenums that discharge air from the face rather than from the bottom or into the exhaust hood and that are isolated from the exhaust hood by the continuously welded shell extending to the lower outermost perimeter of the entire hood assembly do not require a fire-rated damper. In accordance with NFPA 96, Greenheck provides supply duct fire dampers as standard on the following Make-Up Air hood models: Baffle Filter, Dry Cartridge and Water Wash Hoods i

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