UL Labeled Door Specifications

UL logoUL Door labels are 14 or 16 gauge unless otherwise specified. Vertically steel stiffened unless otherwise noted.

3 Hour (“A”)1¾” Doors 1⅞” Doors 2″ Doors4′-0″ x 8′-0″ (Single) 8′-0″ x 8′-0″ (Pair)
1½ Hour (“B”) 45 min. (“C”) 20 Min. (Without Hose Stream)1¾” Doors 1⅞” Doors 2″ Doors4′-0″ x 10′- 0″ (Single) 8′-0″ x 10′-0″ (Pair) 8′-0″ x 8′-0″ Double Egress Pairs, VR x VR 8′-0″ x 10′-0″ (Pair) VR x VR
3 Hour (“A”) ————- 1½ Hour (“B”) 45 Min (“C”)18 GAGE —————— 18 GAGE4′-0″ x 8′-0″ (Single) ————— 7′-4″ x 7′-0″ (Pair) or 7′-0″ x 7′-2″ (Pair)
3 Hour (“A”)Double Egress Pair8′-0″ x 8′-0″Doors have rabbeted meeting edge; frame must be supplied by Karpen Steel.
Up to 1½ Hour (“B”)1¾” Thick “Oversized Doors”4′-6″ x 10′-0″ (Single) 9′-0″ x 10′-0″ (Pair)Auxiliary Fire latch required if pair doors wider than 8′-0″ Fire latch goes in top channel of ACTIVE Leaf.
3 Hour (“A”) 1½ Hour (“B”) 45 Min (“C”)Dutch Door – Single4′-0″ x 7′-2″Top and bottom leaves must latch into strike jamb of frame. Astragal provided between leaves. Dutch door shelf is optional on push side.
1½ Hour (“B”) 45 Min (“C”)1⅜” Thick Door 1½” Door 1⅝” Door 16 or 18 Gage3′-0″ x 7′-0″Vertically steel stiffened.
20 Min (Without Hose Stream)Lead Lined Door8’0″ x 8′-0″ (pair)High Hat Ribs
1½ Hour (“B”)STC 47 Acoustical Assembly3′-0″ x 7′-0″Flush Only 14 Gauge Door and Frame. Sold as unit with sound seals, threshold, and 3 cam lift hinges.
250, 1½ Hr (“B”)Temperature Rise4′-0″ x 8′-0″ (Single) 8′-0″ x 8′-0″ (Pair)100 sq. in. exposed glazing max. A60 Galvanneal Only. Available with WoodGrained A40 Galvannealed Steel. Coreboard Interior.

Considerations For Labeled Doors

  • Must be prime painted or A60 galvannealed.
  • Two Hinges for 60″ jambs or less. One additional hinge for every additional 30″ of height.
  • Must have positive latching on opening (i.e.: panic, VR, strike).

Vision Lite And Glazing For Labeled Doors

  • Doors may be prepared for any UL Classified Glazing material classified for use with Hollow Metal Fire Doors
  • Glazing needs to be listed and labeled.
  • Temperature rise doors are allowed a maximum of 100 sq inches exposed.
  • Lite kits need to be listed and labeled for use in fire doors (such as NGP, Anemostat, etc) or as manufactured by Karpen Steel.
  • Minimum 6″ nominal rails to edge of cut-outs. Can go as low as 5¾” to accommodate stock VL kits.
  • Minimum 6″ nominal mid-rails (cut-out to cut-out).
  • Chart Below shows maximum sizes based on available glazing options as of 2008. When other options become available, the doors can be UL labeled to accommodate the available glazing.
    • “F” = glazing using Firelite® brand of products
    • “W” = glazing using wire glazing materials
DOOR LABELMax Visible Area (sq inches exposed)Max Visible WidthMax Visible HeightNotes
3 Hr (“A”)10012″33″ “F” Glazing if allowed by the Authority Having Jurisdiction
1½ Hr (90-min “B”) or 60 min (1-Hr)10012″33″ “W”
1½ Hr (90-min “B”) or 60 min (1-Hr)1296 36″54″ “F”
45 min (¾ hr “C”) or 20 min1296 36″54″“W” May have multiple lites
20 min 302435″81″“F” May have multiple lites
20 min without hose stream302435 ¾”83 ½” “F” Can go up to 3289 sq in with Pilkington Glazing. May have multiple lites