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 FireKing® Fire Door Model 631 


Fire Rated Doors - 631 Series 

The FireKing® Model 631 fire-rated service door offers superior protection wherever a listed fire door is required for average size door openings (max. width 14’; max. height 12’). The Model 631 rolling steel fire door is designed for both masonry and non-masonry mounted applications including: facilities with paint booths, file rooms, material storage locations, warehouses, shared walls between businesses, public record storage, and public buildings such as libraries. Customized fire doors are available for conveyor openings.

These doors feature a mechanical auto resettable hoist (non-motorized) that enables easy drop test and reset of the fire door in just seconds. Fusible links are mounted on both sides of the wall that separate to automatically close the door in case of fire. Additional safety and protection features are available, including: Fire Sentinel® time-delay release device, FireLite® vision lites, smoke detectors, horns and strobes.

Max width

14’ (4267 mm)

Max height

12’ (3658 mm)


Galvanized steel, 24 gauge
Slat profile available in curved or flat
Standard finish available in gray, tan, white or brown


Roll-formed steel shapes attached to continuous steel wall angle for doors through 12' (3.65 m) wide
Three structural steel angles with minimum thickness of 3/16 inch (5 mm) for doors over 12' (3.65 m) wide
Guides for between jamb doors shall be structural angles
PowderGuard™ Weathered finish with black powder coat

Labels available for masonry or non-masonry applications

UL 1-1/2 hr
UL/ULC 3 hr
UL oversized door

NFPA-80, New York City and state of California (CSFM) compliant

Mechanical auto resettable hoist (non-motorized)

Enables easy drop test and reset of fire door in seconds

Fusible link for added safety

Fusible link separates at 165°F (74°C) to automatically close the door in case of fire

Controlled rate of descent for added safety

Governor controls rate of door descent during a fire

Viscous governor technology

Controls rate of door descent during a fire while reducing noise and vibration for quieter door operation.

Innovative planetary gear design

Ensures years of reliable service and drop-out performance


24 month limited warranty on door
3 year/20,000 cycle limited on door & RHX® operator system (when purchased together)

Standard colors

color swatch whitecolor swatch browncolor swatch TANcolor swatch GRAY

Actual door color may vary slightly from the digital representation above. Color samples are available by request through your local Overhead Door Distributor.

  • Operation: push-up, chain hoist, crank and electric motor (RHX® FK, RHX® or RSX®)
  • Fire Sentinel® time-delay release device
  • FireLite® vision lites
  • UL-listed brush-type smoke seals
  • Flame baffle system (required for optional FM label)
  • Photoelectric or ionization-type smoke detectors
  • Horns and horns with strobes
  • Cylinder locking bottom bar with mortise cylinder
  • Wind load (FBC, TDI, Miami-Dade)
  • PowderGuard™ finish offers a full spectrum of up to 215 colors as well as color-matching to specification