3c circular fire damper

Installed on the supply and return air ducts of ventilation and air conditioning systems, it is usually in an open state. In the event of a fire, when the temperature of the gas in the duct reaches 70 ℃, the fusible link will melt and the valve will automatically close under the force of the torsion spring. It can meet the requirements of fire resistance stability and integrity within a certain period of time and plays a role in smoke and fire prevention. When the valve is closed, output a closing signal.

Smoke and fire control regulating valve, normally open, 70 degree closed, the same as 1, but with an additional electrical signal input, can be remotely controlled to close by the fire control room. It is generally used in the shared air duct system for normal air supply and fire ventilation, and can control the closure of rooms that do not require ventilation during a fire;

Normally open smoke exhaust fire damper, 280 degree fuse closure, normally open, outputs electrical signal. This type is similar to 1, but with a different fuse temperature. It is generally used in fire exhaust pipes passing through firewalls. When the smoke temperature exceeds 280 degrees, it automatically fuses and closes, and can be linked to shut down the smoke exhaust fan.