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DL Series

Standard DL Series is specified to Levels 1-3 extra heavy-duty 16 gauge (20/18/16 gauge available) and 3/16" hinge thread engagement; optional heavier duty DE Series is specified to Levels 1-4 maximum duty 14 gauge (20/18/16/14 gauge available). Premium standard flush door construction combines pan-style panels with optional lock-side bevel, and full height center seam projection welded edges.

The continuous bonding of the laminated core to steel face sheets provides an attractive, flat door, free of face welding marks. Tests have proven that the DL/DE Series door has a high resistance to impact damage, low thermal conductivity and high STC ratings.



Strength, durability and ease of installation

  • Variety of core systems laminated to both steel faces, enhancing the structural integrity of the whole door
    • Standard Honeycomb cell (STC 38 / U=0.59 / R=1.69 per ASTM 1363) has crushed edges to create greater surface area for unfailing adhesion to the steel door faces, reducing the weight of the door while providing the greatest structural integrity. With light colors, this core helps to avoid thermal bow from direct sun exposure
    • Optional Polystyrene (STC 35 / U=0.41 / R=2.43 per ASTM 1363) and Polyurethane (STC 33 / U=0.39 / R=2.56 per ASTM 1363) cores for enhanced thermal performance
  • Square edge design allows for non-handed inventory control in local distribution. 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
  • 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

As our versatile flagship door, the standard DL Series door and optional DE Series with alternate, heavier duty construction, are supported by countless standard and custom options for broad commercial applications from full glass architectural entrances to secure back doors and interior passages in hotels, offices and restaurants, multifamilies and apartments, hospitals, schools and more. Depend on the DL and DE Series door from Republic; depend on the strength of steel.

Technical Data Guide

For more information, download the Republic Technical Data Manual.

  • DL Series (Pages 14-17), DE Series (p 18-21), thermal & sound (p 26), fire rated (p 98-99), 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 15/DL, 18/DE, 131-135)