What is the maximum glass light size on a 90 min (1 1/2 hour) fire rated door?

Maximum glass light size for a 90 minute (1 1/2 hour) door depends on the type of glass being installed.

  1. Wire glass = 100 square inches is max exposed glass when wire glass is used.
    • Note - many code are outlawing the use of wire glass due to the hazards of injury from glass breakage.
  2. Ceramic glass (FireLite, etc.) = 1296 square inches per light is allowed if used with Firelite or other appropriately listed glazing material.
    • Max width is 36" or height of 54".

Multiple glass lights: UL listed L-series doors may have multiple lights provide each light does not exceed 1296 square inches of exposed glass area.


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