The RD521-IP ceiling radiation damper employs butterfly style blades for point-of-origin control of radiant heat in HVAC systems. The RD521-IP is installed horizontally in the ceiling membrane of combustible and non-combustible assemblies with fire resistance ratings up to and including 1 hr.
C&S Air Products Ceiling Radiation Damper, 12 x 6 in, Butterfly Blade, 22 ga Gauge, Steel, Galvanized, 165 deg F