Exhaust fire damper is installed in the exhaust pipe system, within a certain period of time to meet the requirements of fire-resistant stability and fire integrity requirements, the role of fire smoke from the valve. Action temperature is generally 280 ℃. A fire, smoke fire damper can be opened automatically or manually smoke, when the flue gas temperature reaches or exceeds 280 ℃, the valve automatically shut down to prevent the spread of fire. Exhaust fans should be guaranteed at 280 ℃ can still work continuously for 30min. Exhaust fire damper setting requirements are: (1) exhaust system exhaust manifold, smoke exhaust valve should be set. (2) Exhaust air duct into the exhaust fan room, should be set fire smoke damper, and exhaust fan linkage. (3) In the exhaust pipe that must pass through the firewall, a smoke damper shall be set up and linked with the exhaust fan.