What is the largest size visible glazing that can be put into a fire rated door?
The required hourly rating will dictate the approved glazing lights available. All glazing used in fire doors must be listed and labeled.
Basic guidelines on glass are as follows:
- 20 Minute: 1,296 sq. inches per light with neither dimension exceeding 54”
- 45 Minute: 1,296 sq. inches per light with neither dimension exceeding 54”
- 1-1/2 Hour: 100 sq. inches per door leaf max
- 3 Hour: Flush door, No glass
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