The fire damper of the roof smoke exhaust fan is used to directly stop the smoke exhaust fan after the fuse is blown. There is a bimetal melting piece inside the damper, which automatically fuses at 280 degrees and can be disconnected to stop the fan from working. That is the function of sign 3 in the picture above. If the pressurized fan is used, the action is used to turn on the feedback signal 2 or 4
The 30,000 cubic air volume smoke exhaust fan is multiple
The fire smoke exhaust fan is usually not turned on!
Smoke exhaust systems generally have three types of air valves:
1. Fire damper, normally open, generally refers to a 70°C fire damper. When the air medium temperature in the air duct exceeds 70° At C, the valve is closed.
2. The smoke exhaust valve is normally closed and usually opens after receiving the fire linkage signal.
3. The fire smoke exhaust valve is normally closed and opens when receiving the fire linkage signal; it closes when the air medium temperature exceeds 280°C.
Under normal circumstances, the valve and the fan are linked!
The smoke exhaust fan with an air volume of 30,000 cubic meters weighs 200KG. The 30,000 cubic meter air volume smoke exhaust fan is a low-pressure fan. Shaft power 7.5kw. Leave the hole size 1200 by 1200. The air volume ranges from 1275m3/h to 55215m3/h. Static pressure reaches 650Pa. The fan is composed of an impeller, motor, casing, hood, current collector, fixed bracket, transmission device, air valve and other components.