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The Fire rated downlight is designed to automatically seal the ventilating holes. The intumescent disk forms a dense carbon char which shuts off heat ventilating holes on the sides so that fire cannot reach the next floor through the downlights. This could be the difference between life and death for people in an assisted living or hospitality facility.
The ceiling systems of commercial construction are required to meet certain hourly fire ratings. Even though recessed is often the preferred light source, the clearance hole required in the ceiling for recessed completely voids the fire rating of the structure, Conventional recessed is inadequate to re-establish the fire rating of the ceiling after the hole has been cut for the light fitting.