UL rated for use in 1, 2, or 3 hr fire rated ceilings|Galvanized steel frame|High temperature, non-asbestos, reinforced fiber thermal fabric|212 deg F fusible link|Stainless steel negator type closure spring|RD1 (12-1/2 x 12-1/2 in) fits Broan LoSone Select L100, L150, L200, L250 and L300 series
NuTone LoSone Select Ceiling Radiation/Fire Damper, For Use With: 100, 150, 200, 250 and 300 cfm Ceiling Mount Model, 12-1/2 in L x 12-1/2 in W