max fire rated vision

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Maximum glass light size for a 90 minute (1 1/2 hour) door depends on the type of glass being installed. Wire glass = 100 square inches is max exposed glass when wire glass is used. Note - ma...
ITS/WHI Fire Rated three (3) frames are available in the following maximum door opening sizes: F and FN-Series: 4' 0" X 10' 0" single door 8' 0" X 10' 0” double door or pairs MU-Series: ...
Maximum glass light sizes for 3 hour fire doors is as follows: Wire glass - not approved for use in 3 hour fire doors. Ceramic glass: UL & ITS/WH allow one (1) light with 100 square inc...
GrainTech® is available with very broad fire ratings. The option of GrainTech® does not affect the fire rating of the door. Fire ratings depend on the door series, hardware and applications. ...
Fire Rated three (3) frames are available in the following maximum door opening sizes: F and FN-Series frame: 4' 0" X 10' 0" single door opening 8' 0" X 10' 0” double door opening MU-Ser...
DW-Series Fire Rated Borrowed Lights are available in the following sizes: 60 minute (1 hour) rating = 2721 square inches of visible glass. maximum frame rabbet to rabbet dimensions = 78 1/4...
Maximum UL Fire Rated door sizes are as follows: A-Series: 4' 0" X 8' 0" single door 8' 0" X 8' 0” double door or pairs B-Series 4' 0" X 10' 0" single door 8' 0" X 10' 0” double doo...
Non fire rated doors can be furnished with a maximum 3" diameter hole for viewer preparations. Fire rated doors have a 3/4" maximum holes size unless otherwise listed by UL or ITS/WHI. Viewers mus...