Damper with a tunnel casing extension at one or both sides so that the damepr blade does not exceed the tunnel. This version includes a circular connection of diameters up to 1000 mm.

CU2L+PR+PR CFTH: CU2L+PR+PR with CFTH mechanism. It unlatches the damper lade when the temperature in the duct rises above 72ºC. Due to the rise in temperature the fusible link melts. This causes an armed internal torsion spring to unwind and thereby release the damper blade into its safety position (closed). The fusible link must be replaced after functioning. The damper can be unlocked manually to test the proper functioning of the mechanism. The damper must be reset manually.

CU2L+PR+PR ONET: CU2L+PR+PR with ONE T mechanism. ONE T is a spring-return actuator. When powered, the actuator moves the damper blade into its stand-by position. When the power is interrupted or when the tempeature in the duct exceeds 72ºC, the internal armed spring brings the damper blade back into its safety position.

An integrated LED indicates the open or closed position of the motor. The (included) beginning and end of range switches indicate the position of the damper blade (on a control panel). 

There are 2 models of ONE T: 230 V c.a. and 24 V c.a.