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Broan-NuTone RD1 12-1/2" X 12-1/2" Vibration Dampening HangersSince their beginning in 1932, Broan has pioneered many of the product innovations now established as standards of the industry. Today, Broan carries on the commitment to provide the finest products in the industry.Broan-NuTone RD1 12-1/2" X 12-1/2" Vibration Dampening Hangers Features: Accessories, Radiation Dampers, Vibration Dampening Hangers Ceiling Radiation/Fire Damper for 100, 150, 200, 250 & 300 CFM ceiling mount models. UL rated 3 hours. UL rated 3-hour ceiling radiation dampers Galvanized steel frame High temperature, non-asbestos, reinforced fiber thermal fabric 212 F fusible link stainless steel negator-type closure spring For L100/150/200/250/300 Series.