?? Damper: installation in the ventilation, air conditioning system, the return air duct on the road, usually was turned on, when the gas pipeline fire when the temperature reached 70 ℃, fusible film fuse, the valve automatically closes under the force of the torsion spring within a certain period of time to meet the fire resistance stability and fire integrity requirements, from smoke fire retardant valves. When the valve is closed, the output off signal. Smoke damper: Install exhaust system pipeline, usually generally was closed when the fire manual or electric opening, from the smoke effect. When the internal temperature of the flue gas exhaust pipe 280 ℃ closed within a certain period of time to meet the fire resistance stability and fire integrity requirements, from the valve exhaust effects. ?? Damper -? Principle installed in the central air-conditioning duct system works easily fusing temperature control gold using gravity acting and spring mechanism closes the valve. When a fire occurs, the fire invaded the duct, high temperature causes the fusible alloy melting on the valve, or to memory alloy deforms the valve automatically closes, for air duct and the fire district throughout occasions. Damper - Category 1 fire dampers, normally open, 70 degrees is closed, usually installed in the duct through the firewall, fires off the role, you can set the output electrical signal, the temperature exceeds 70 degrees when the valve is closed, the linkage to send (fill? ) off the fans; 2. smoke fire control valve, normally open, 70 degrees closed, with 1, but more than a telecommunications signal input, remote control can eliminate the control room is closed, generally used for peacetime air, fire up a common air duct system may be controlled fire off unneeded air make room; 3. normally open type smoke damper, 280 degrees fuse closed, normally open, output electrical signal, and one that is similar to, but different fusing temperature, generally used Fire exhaust pipe through the firewall, the flue gas temperature exceeds 280 degrees when automatic fuse off, you can turn off the exhaust fan interaction. Exhaust valve: 1. smoke damper normally closed (NC, telecommunications numbers turned 280 degrees blown off, or manually turned off) generally used in exhaust systems, exhaust fan in the suction port can install one, when fire Consumers control the opening by the control room, can be turned off when the chain closes the exhaust fan. 2. The exhaust valves, with the three, each unit different names, some based on its operating temperature is called the exhaust valves, and some based on its use of nature called the damper, but only for the common damper device side of the fuse metal fuse into that kind of 280 degrees. 3. The automatic smoke damper (underground engineering) Fire subway ventilation and air conditioning systems, exhaust valve having automatic fire alarm equipment and gas extinguishing system linkage control functions. Each automatic smoke dampers with two independent electric control signal, respectively, by EMCS, gas consumption system to monitor, control signals are DC24V ± 10% signal. Each automatic smoke dampers have six independent feedback signal (three open place, three off place) feedback signals are normally open dry contact signal. Exhaust port: If you installed the necessary piping exhaust valve, use an ordinary single Grille can; otherwise required plate discharges, it is also the institution with the smoke damper.