25 Max Size Allowed Limitations Max Hourly Rating Neutral or Positive Pressure Maximum Glass Size Allowed Single, Pairs or Double Egress 3'0" x 7'0" Unit, Mortise, or Cylindrical Latches/Deadbolts max 2 3/4" backset, door bottoms, thresholds. 20 minutes Neutral Pressure 792 square inches Single Only 3'0" x 7'0" Unit, Mortise, or Cylindrical Latches/Deadbolts max 2 3/4" backset, Mortise Exit Devices/Surface mounted Vertical Rod Fire Exit Devices, RIM Type Fire Exit Devices/Surface Mounted Closers, door bottoms, thresholds. 90 minutes Neutral Pressure 100 square inches Single Only 3'0" x 7'0" Unit, Mortise, or Cylindrical Latches/Deadbolts max 2 3/4" backset, Mortise Exit Devices/Surface mounted Vertical Rod Fire Exit Devices, RIM Type Fire Exit Devices/Surface Mounted Closers, door bottoms, thresholds. 20 minutes Neutral Pressure 792 square inches Single Only 3'6" x 7'0" Unit, Mortise, or Cylindrical Latches/Deadbolts max 5" backset, Mortise Exit Devices/Surface mounted Vertical Rod Fire Exit Devices, RIM Type Fire Exit Devices/Surface Mounted Closers, door bottoms, thresholds. 90 minutes Positive Pressure 100 square inches Single Only 3'0" x 8'0" Unit, Mortise, or Cylindrical Latches/Deadbolts max 2 3/4" backset, Mortise Exit Devices/Surface mounted Vertical Rod Fire Exit Devices, RIM Type Fire Exit Devices/Surface Mounted Closers, door bottoms, thresholds. 20 minutes Neutral Pressure 792 square inches Single Only 3'0" x 8'0" Unit, Mortise, or Cylindrical Latches/Deadbolts max 2 3/4" backset, Mortise Exit Devices/Surface mounted Vertical Rod Fire Exit Devices, RIM Type Fire Exit Devices/Surface Mounted Closers, door bottoms, thresholds. 90 minutes Neutral Pressure & Positive Pressure 100 square inches Single Only 4'0" x 8'0" 20 Gauge Only, Unit, Mortise, or Cylindrical Latches/Deadbolts max 2 3/4" backset, Mortise Exit Devices/Surface mounted Vertical Rod Fire Exit Devices, RIM Type Fire Exit Devices/Surface Mounted Closers, door bottoms, thresholds. 90 minutes Positive Pressure 100 square inches Single Only FIRE RATED DOORS Steel doors with a steel edge are tested to withstand a minimum of 90 minutes of fire exposure at temperatures reaching more than 1,400 degrees Fahrenheit. Fire rated doors are tested and classified by Intertek’s Warnock Hersey. 4x25 5x20 10x10 FIRE GLASS Other styles are available by request. The maximum visible glass size for fire-rated doors is 100 sq inches.
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