Model URD-SRE damper is a round single blade damper constructed from heavy gauge galvanized steel. The motor actuator is direct coupled to the blade shaft. It is a power close/spring open ( 4 to 10 in are field reversible, 12 to 16 in are not field reversible) style actuator taking approximate 5 sec to open the damper. The URD-SRE damper may be used with either flexible or rigid ductwork. When the URD-SRE is closed it is sealed with a foam gasket for a tight seal.