The 2012 ibc model building code contains size limits for vision panels in a 60 or 90 minute door.
Fire door vision panel sizes.
Regulations for maximum vision panel sizing on fire doors.
This will leave you with max glass vision panel size of 1559 x 926.
Size limits for vision panels.
Subject to door size.
There are many types of glass and glazing available for vision panels depending on the type of protection you require such as fire security safety thermal properties acoustic or a combination of these purposes.
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Users are frequently confused about the door vision panel sizes permitted in 60 and 90 minute fire doors under the ibc.
Size limits for vision panels in 60 or 90 minute doors.
For functional and safety purposes many fire doors will need to have glazing in the form of vision panels.
Glass sizes and core regulations when working with fd30 and 44m doors.
The tall narrow vision panels and combination narrow vision sets meet these requirements.
Nfpa 80 standard for fire doors and other opening protectives regulates the size of the glazing allowed in these applications in table 4 4 5.
This confusion stems from a conflict between nfpa 80 size limits and the size limits prescribed by the ibc and the fact that the listing agencies have tested and listed fire protective glazing in sizes not permitted by the ibc.