It has a galvanized steel frame and will fit in either a wood frame ceiling or a T-bar ceiling. When installed in conjunction with one of the listed Panasonic WhisperCeiling Exhaust Fans the radation damper willl meet or exceed NFPA-90A (National Fire Protection Association) requirements and UL 555C. Local fire codes sometimes requre that a radiation damper be installed with an exhaust fan in fire-rated floor-ceiling and roof-ceiling designs.

Note that the radiation damper will sit beneath the fan housing, so it will add about 5 inches to the overall height of the ceiling fan. It may not, therefore, be able to fit within all joist cavities.

• UL Classification (UL Standard 555C): Yes, for use 1, 2 or 3 hour fire-rated floor/ceiling and roof/ceiling designs
• 165° F Fusible Link: Yes
• Thermal Fabric: High Temperature, Non-Asbestos, Reinforced Fiber
• Warnock Hersey Classifed: Yes