The FSDR25 is a "true round" Class 1 leakage-rated combination fire and smoke ... closure through the damper actuator. THE EFL and PFL allow the damper to reopen automatically after a test, smoke ...

Ruskin’s TED40 Economy Insulated Thinline Control Damper provides low leakage and thermal performance in a thin line, 4-inch-deep frame. The blade profile stays in the full open position, making it ...