Model 635

The FireKing® Insulated Fire-Rated Doors Model 635

Our insulated 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.



Standard max width

24’0″ (7315 mm)

Standard 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; Flat slat profile; Standard finish available in gray, tan, white or brown


Three structural steel or stainless steel angles. Guides also include locking bar or wind bar PowderGuard® Weathered finish with black powder coat

NFPA-80, New York City and state of California (CSFM) compliant
Labels available for masonry or non-masonry applications

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

Mechanical auto resettable hoist (non-motorized)

Enables easy drop test and reset of fire door in seconds

Fusible link for added safety

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 operator system (when purchased together)

Door Options

Door Options

  • 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)
  • Smoke detectors
  • Horns and horns with strobes
  • Cylinder locking bottom bar with mortise cylinder
  • Wind load (FBC, TDI, Miami-Dade)
  • PowderGuard® Premium powder coat finish options are available in approximately 200 colors as well as custom matching to specification.​
  • PowderGuard® Zinc and PowderGuard® Weathered finishes​​


Standard Exterior Color

  • White

  • Gray

  • Tan

  • Industrial Brown

Actual door color may vary from the digital representation shown here. Actual color samples are available by request through your Overhead Door Distributor.

Powder Coat Color Options

PowderGuard® Premium powder coat finish options are available in approximately 200 colors as well as custom matching to specification. PowderGuard® Weathered finish, a thicker, industrial textured powder coat, is available in 11 colors providing enhanced scratch resistance as well as aiding in hiding the dirt and blemishes that often occur in commercial environments.


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