"Ceiling Radiation Damper

Radiation Damper is a heat barrier which protects against fire spread through holes cut in ceilings for ventilation fans. Another fire-safe option is to install a WhisperValue/Value Lite fan, which can be installed in a wall rather than a ceiling.

Fire codes may require a ventilation fan installed in a fire rated floor/ceiling or a roof/ceiling assembly to be equipped with a specially tested and classified radiation damper. In case of a fire, the radiation damper closes to prevent the spread of fire and heat. Panasonic radiation dampers are designed to protect ceiling penetrations in 1, 2 or 3 hour fire-rated floor/ceiling and roof/ceiling designs. All Panasonic radiation dampers meet or exceed the following: UL Classified 555C and National Fire Protection Association NFPA-90A.


  • UL classification (UL standard 555C) for use in 1, 2 or 3 hour fire-rated floor/ceiling and roof/ceiling designs

  • Compatible with 50-150 CFM fans, fans with motion sensor and select fan/lights

  • Galvanized steel frame with 165°F fusible link

  • High temperature, non-asbestos, reinforced fiber thermal fabric

    • Fan Model approved for:
      WhisperGreen Select™, WhisperCeiling 50-150 CFM, WhisperLite, WhisperSense, WhisperSenseLite, WhisperWelcome, WhisperFit, WhisperFit Lite, WhisperValue, Whisper Value-Lite"