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

Standard listed wire glass: one (1) light with 100 in2 per door leaf max.

Firelite or other appropriately listed glass:

• FM maintains one (1) light with 100 in2 per door leaf max.

• UL & ITS/WH available up to 1850 in2 max visible glass per light, max width 36", max height 54" (Dezigner trim max area is 1296 in2).

Multiple lights permitted:

• UL: provided each light does not exceed the 1850 in2 maximum.

• ITS/WH: provided each light does not exceed the 1850 in2 max: maximum combined glass area may not exceed the published maximum glass area listing of the glass manufacturer.


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