Nutone Bath Ventilation Fan Fire / Radiation Damper, Nutone 80RDB, Nutone 110RDB, Nutone HD50RDB, Nutone HD80RDB, Nutone RDA
Many local codes require that
exhaust fans installed in fire-rated ceilings must be protected by dampers,
which, in case of fire, protect against the spread of heat and flame.
Being fire-rated means the ability of a wall, floor/ceiling, or roof/ceiling to
withstand the effects of fire for a specified period of time. NuTone ceiling
radiation dampers are designed to protect the openings in 1-, 2-, or 3-hour
fire-rated floor-ceiling and roof-ceiling designs.