HIGH-QUALITY DAMPER: Premium radiation damper for use in 1, 2, and 3 hour rated floor-ceiling and roof-ceiling constructions DURABLE: Features a galvanized steel frame construction and stainless steel closure springs for long lasting use OUTER FRAME: Separate outer frame allows complete fan and damper serviceability without disturbing the surrounding ceiling material FEATURES: Includes a high temperature, non-asbestos, reinforced thermal fabric and 165°F fusible link for your convenience COMPATIBLITY: Designed for use with Broan-NuTone LP80, LP110, RB80, RB110, XB50, XB80, XB110, ZB80, ZB110, and NuTone LPN80, RN80, RN110, XN50, XN80, XN110, ZN80, ZN110, XN50C, XN90C, XN110C, ZN90C, ZN110C