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Model 255 / Single sliding u.L. Rated fire door

Single Sliding U.L Rated Fire Door for Pharmaceutical and Industrial Environments

Safety and aesthetics

This revolutionary sliding fire door system from ASI Doors offers exceptional performance, UL compliance and a superior aesthetic design that complements any cleanroom environment. The Model 255 power operation has a U.L. 10B, 90 minute fire rating.

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Door Sizes

  • Up to 8’ x 9’

Panel Construction

  • 1-3/4”thick 20 ga., 304 #4 stainless steel panel U.L. rated panel
  • 20 ga. stainless steel edge cap for added protection and durability
  • Full perimeter gaskets: Non-marking gray polyurethane, blade type
  • Fire ratings include 20-min, 45-min, 60-min and 90-min (rating determined during quote stage)

Frame Construction

  • 12 ga. 304 #4 stainless steel header with 3/16” stainless steel rail assembly
  • 7 ga., stainless steel trolley assemblies
  • Complete header and rail enclosed with a 16 ga. 304 #4 stainless sloped shroud
  • 16 ga. 304 #4 stainless steel side frames with floor hardware attached (nothing mounted into the floor)
  • 316 stainless steel optional

Performance Features

  • 1/4 h.p. electromechanical operator with NEMA 4X control box. Alternate power source must be provided by customer; or optional battery back-up for emergency operation in case of fire
  • Standard pushplate to open - time delay to close
  • Reversing edge for instant stop and reverse
  • Standard dual side frame mounted reversing photoeyes
  • In case of power failure, power doors can be manually operated at any time


  • U.L. rated vision panel with standard U.L. rated sloped frame (size and material subject to U.L. guidelines)
  • Touch-less activation switches
  • Custom designed interlocking system
  • Actuators: variety of activation devices available upon request
  • Pre-announce to close kit (light/alarm/combo)
  • Alternate battery back-up power source
  • Heat sensor
  • Smoke sensor


  • One year limited warranty on all components

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