Louvers are often fixed for a constant flow rate. Dampers are made of metal and usually square, circular, or rectangular in shape. Some industrial dampers are designed for pressure relief, or ...

Description: POWER CLOSED, SPRING OPEN MOTOR CONNECTION TYPE PUSH TERMINAL MOTOR TIMING 30 SECOND (POWER OPEN)/10 SECOND (SPRING RETURN) MOTOR/ACTUATOR MOUNTING TYPE SIDE/TOP SERIES ARD MODEL ...