On fire rated transom and/or sidelight frames and fire rated window frames, Steelcraft labeling procedures only control the O/A width and/or height of the frames based on wall condition. The amount of allowable or exposed glass is determined by type of glass being used and will vary depending on the hourly rating required. All glass being used in a fire rated opening must be an approved listed glazing material.
For Listed 1/4" Wire Glass the maximum sizes are:
For other listed glazing types the maximum allowable glass sizes are based on hourly rating required (20, 45, 60 or 90 minutes) and determined by the actual glass manufacturers tested approvals. A list of some of the approved glass types are:
All approved listed glazing material must be installed in accordance with the glazing manufacturers requirements.
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