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DL Series Temperature Rise Doors

DL-TR Series Temperature Rise doors provide a mineral board core with a 250°F (121°C) max temperature rise rating at 30 minutes of test exposure, typically used in stairwells for safe egress from a building. Optional heavier duty DE-TR Series available for 14 gauge door requirements.

These doors are designed to meet the architectural requirements for full flush doors, from light to 14 gauge maximum duty. Premium standard flush door construction combines pan-style panels with optional lock-side bevel, and full height center seam projection welded edges.



Strength, durability and ease of installation

  • Non-handed / square edge design with optional lock edge bevel 1/8" over 2" (~3˚)
  • Hinge and lock edges are reinforced with continuous 16 gauge steel channel the full height of the door, welded at a max 5" OC (optional 10 gauge hinge and 14 gauge lock channel with DE Series)
    • Universal standard/heavy weight hinges are used with hinge fillers to allow for easy modification from heavy to standard weight hinge preps
    • Standard visible edges may be filled seamless, intermittently stitch welded and filled, or continuously welded and filled
  • Top flush and bottom inverted channels provide excellent door stability with 16 gauge steel channels, projection welded at a max 2-1/2" OC
  • Standard 14 gauge inverted top and bottom channels provide excellent door stability, and is able to be dressed with top and bottom caps
  • 16 gauge mortise or cylindrical lock reinforcements are of an integral type in accordance with ANSI A115 standards
  • Various light and louver sizes are available with light kits standard (no glass unless noted)
  • Standard cold rolled steel in 20, 18, 16, or 14 gauge skins, with optional A60 galvanealed in 18, 16, 14 gauge. G90 available in 16 or 14 gauge

Exceeds industry standards

  • Republic is SDI Certified through regular audits to ensure manufacturing, performance and quality standards set by the Steel Door Institute
  • Overall door construction exceeds ANSI A250.8-2017 (SDI-100), the standard set by SDI specifying sizes, design, materials, construction, finishing and performance for standard commercial steel doors and frames
  • Hardware preparations and reinforcements meet ANSI A250.6-2003, and locations meet ANSI/DHI A115, unless otherwise stated
  • Doors meet the broadest fire rating requirements; they are listed for installations requiring compliance to both neutral pressure testing (ASTM E152 and UL-10B) and positive pressure standards (UL-10C)
  • Factory-applied baked-on rust inhibiting primer meets ANSI A250.10-2011

Typical applications

Special stairwell doors to allow for safe egress in the event of a fire.

Technical Data Guide

For more information, download the Republic Technical Data Manual.

  • DL-TR Series (Pages 14-17), DE-TR Series (p 18-21), thermal & sound (p 26), fire rated (p 106), miscellaneous TOC (p 107), door options (p 108-116), paint (p 117-118), vision kits (p 119), louvers (p 120), standard hardware locations (p 121-130), specification 08110 (p 16, 19, 131-135) 


 Fire Rated



Republic Technical Data Manual