Sliding UL-rated fire door

Proudly protecting Canadian warehouses, manufacturing plants and loading docks

Marathon Single and Bi-Part Sliding U.L.-Rated Fire Doors

U.L.-rated: U.L. 10B, 90-minute fire rating.

High strength: 1-3/4″ thick 16-gauge stainless steel panel(s) provide strength and are easy to clean.

Tight seal: A full perimeter containment seal protects personnel and goods between positive and negative pressure zones.

Durability: This door utilizes corrosion-resistant, heavy-duty hardware for superior durability.

Increased safety: Instant stop and reverse of door operation once obstructions are detected by photoeyes.


U.L. 10B, 90-Minute Fire Rating

Using cutting-edge technology and exacting criteria for quality, Marathon 255 and 256 fire door models have surpassed market demands for quality, performance and U.L. compliance with a 90-minute fire rating. From its unitized high strength 1-3/4″ thick 16-gauge stainless steel panel(s) for easy cleaning, to its attractive, streamlined design, the Marathon single sliding fire door and bi-part sliding fire door is ideal for a variety of demanding commercial and industrial applications.

Model: 255 U.L.-rated single sliding fire door
Model: 265 U.L.-rated bi-part sliding fire door

Unmatched U.L.-Rated Sliding Fire Door

16-gauge, 304 #4 stainless steel panel will not fade or corrode, even when exposed to chemical cleansing agents. Exclusive all stainless steel track and trolley assemblies are enclosed in a stainless steel sloped shroud for less wear, exceptional performance and streamlined appearance.

Exclusive all-stainless steel (no aluminum or other soft metals) heavy-duty rail and trolley assembly with stainless side frames and floor hardware. Ideal for cart and transporter traffic. Heavy-duty stainless steel panel, internal steel frame and external stainless steel edge capping. High efficiency, 1/4 h.p. electromechanical operator, heavy-duty nylon roller wheels, and a Kevlar-reinforced drive belt, ensures efficient and continuous operation, minimizing downtime and increasing productivity.

Continuous three-sided non-marking vinyl gasket, and bottom sweep gasket ensures the tightest seal. Floor hardware maintains door position under positive and negative pressures without compromising seal. Totally adjustable floor and panel hardware.


Customers That Love These Products


Marathon 255 Single Sliding U.L.-Rated Fire Door

Marathon's 255 sliding U.L.-rated fire door features a single stainless steel fire door with power operation.

Marathon 265 Bi-Part Sliding U.L.-Rated Fire Door

The 265 sliding U.L.-rated fire door features two bi-parting stainless steel panels.

Model Comparison Chart

255 Single Sliding 265 Bi-Part Sliding
Number of panels 1 stainless steel panel 2 stainless steel panels
U.L. rating
10B, 90-minute fire rating
Max. size
Panel construction
Unitized design using 16-gauge stainless steel continuously welded panel(s) with full perimeter non-marketing gray vinyl, blade type gaskets
1/4 h.p. electromechanical operator with NEMA-4 fiberglass control box
Opening speed
Closing speed
2 remote mounted pushplates
1-3/4" thick honeycomb core
Reversing edge
Yes – instant stop/reverse functions activated using photoeyes


  • Galvanized steel clad panels.
  • Flat shroud (requires 14" headroom).
  • Vision panels - wire mesh or clear fire lite (optional sizes).
  • Available in 20, 45, 60 and 90 minute fire ratings. Larger vision panels only available with 20 and 45 minute fire rating models.
  • Push plates remote mounted.
  • Additional reversing photoeyes mounted in side frames.
  • Touchless wall-mounted activation switch.
  • Activation devices include: pull cord, photoeye, radio control, loop detector, motion detector, and O/C/S push button.
  • Interlock system.
  • Battery back-up power supply.


  • 1 year limited.