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 FireKing® Insulated Fire Door Model 635 


Fire-Rated Insulated Rolling Service Doors 

The FireKing® Model 635 fire-rated rolling service door offers superior protection wherever a listed insulated fire door is required (max. width 24’; max. height 24’). The Model 635 insulated rolling steel door serves as a thermal barrier, ideal for applications which require separation due to climate control requirements. The insulation used in this door offers added energy efficiency (R-value of 4.5), sound transmission control (STC 21), and the mineral wool utilized in the slat insert meets the Smoke and Flame Index of 5.

Common masonry and non-masonry mounted applications include: facilities with paint booths, file rooms, material storage locations, warehouses, shared walls between businesses, public record storage, and public buildings such as libraries. The Model 635 insulated fire door is available with UL (FM optional) labels for 1-1/2, 3, 4 and oversized doors.

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

24’0" (7315 mm)

Max height

24’0" (7315 mm)

Energy efficient

Insulation R-value of 4.5

Sound Transmission Class 21

Ideal for applications that require sound control


Galvanized or stainless steel, in a variety of gauges
Slat profile available in curved or flat
Standard finish available in gray, tan, white or brown


Three structural steel or stainless steel angles with minimum thickness of 1/4 inch (6 mm) mounted to the face of the jamb
Guides also include locking bar or wind bar
PowderGuard™ Weathered finish with black powder coat

Labels available for masonry or non-masonry applications

UL 1-1/2 hr (FM is optional)
UL/ULC 3 hr (FM is optional)
UL 4 hr
UL oversized door (FM is optional)

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

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 white color swatch brown color swatch TAN color swatch GRAY
White Brown Tan 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: 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