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Ceiling Radiation Dampers for Bath Fans

Quick Overview

Hourly-rated floor/ceiling membranes are designed to protect a structure from heat and subsequent potential collapse. Vented fans installed in these assemblies penetrate the fire-resistive membrane.

To protect the ducted opening against the spread of heat and fire, many local codes require the installation of a ceiling radiation damper. Installed between the housing and grille, the damper employs an insulation blanket that closes off the opening in an emergency by means of a heat-sensitive fusible link. The ceiling dampers below meet UL Standard 555C and are labeled for use in fire-resistive floor/ceiling membranes.


  • UL tested and labeled (UL Standard 555C) for use in 1, 2, and 3-hour floor-ceiling and roof-ceiling construction
  • removable damper assembly and sleeve to allow easy motor replacement
  • UL approved insulation blanket constructed of non-asbestos, high-temperature reinforced fiber thermal curtain
  • Heat sensitive 165° replaceable fusible link
  • .024 galvanized steel frame

Need more information? Choose a specific unit in the product family section below to learn more!
Alias SKU(s) NXRD

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Because of our ongoing commitment to the development and manufacture of high quality products, product specifications are subject to change without notice.