FeaturesFolded ceramic curtain style damper to meet both combustible and non-combustible UL assembliesAllows for two stage construction, fan housing and damper sleeve during framing, fan/motor/damper installation after finishesEasy access to fan/motor/damper for maintenanceCompatible with most Panasonic 10-1/4 in 50 to 150 cfm fans, fan/lights and fans with motion sensorGalvanized steel frame with 165 deg F fusible linkHigh temperature, non-asbestos, reinforced fiber thermal fabric damper