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The SL-Series Square Edge Flush Doors are designed to meet the architectural requirements for full flush doors.
This door construction combines the strength and dimensional stability of steel with the structural integrity of the laminate core. The continuous bonding of core to steel face sheets provides an attractive, flat door, free of face welding marks. Tests have proven that the construction employed has integral high resistance to impact damage, low thermal conductivity and high STC ratings.
To meet application, specification and performance requirements, the SL Series Door offers options including sizes, glass light designs and hardware preparations.
SL-Series Doors are 1-3/4˝ (45mm) thick, with Square Edges.
Features and Benefits
  • Core Systems that enhance the structural integrity of the door:
    • Honeycomb (standard) – 1” (25mm) cell kraft honeycomb configuration that increases structural integrity while reducing overall weight
    • Polystyrene (optional) – enhanced thermal performance
  • Full Height, Epoxy Filled Mechanical Interlock Edges provide structural support and stability the full height of the door edges
  • Standard Hinge Preparations for 4 1/2” (114mm) x .134” (3.3mm) standard weight or .180” (4.7mm) heavy weight hinges
  • 14 Gage [0.067” (1.7mm)] Inverted Top and Bottom Channels provide stability and protection for the top and bottom edges from abuse
  • Square Hinge and Lock Edges allow for non-handed inventory control for local distribution
  • Recessed Dezigner™ Glass Trim provides a clean, neat and flush finish with the door surface
  • Factory Applied Baked-On Rust Inhibiting Primer paint in accordance with ANSI A250.10-1998 (R2004)


  • Door construction meets the requirements of ANSI A250.8-2003 (SDI 100)
  • Hardware preparations and reinforcements are in accordance with ANSI A250.6-2003. Locations are in accordance with ANSI/DHI A115 unless otherwise stated.
  • Meet the broadest fire rating requirements
Finish Paint
  • Rookwood Brown
  • Downing Earth
  • Downing Stone
  • Downing Sand
  • Aurora Brown
  • Weathered Shingle
  • Chelsea Gray
  • Black Bean
  • Spalding Gray
  • Blonde
  • Mannered Gold
  • Burgundy
  • Luxurious Red
  • Sierra Redwood
  • Homberg Gray
  • Cascades
  • Raisin
  • Pool House

Standard Laminated Honeycomb Core

  • 1” (25mm) cell, 99 pound Kraft honeycomb
  • Honeycomb surfaces sanded for maximum adhesion
  • Impregnated with phenolic resin (resists mildew and vermin)
  • Laminated to both face sheets with contact adhesive
  • Assembled door is run through high pressure pinch rollers, achieving ultimate bond

Optional Polystyrene Core

  • 1 pound (453.6g) per cubic ft density slab
  • Laminated to both face sheets with contact adhesive
  • Labeled applications

Standard Premium Edge Construction

  • Beveled hinge & lock edges
  • Full height mechanical interlock with epoxy adhesive
  • Visible edge seam standard

Standard Rigid 14 Gage End Channel Construction

  • 14 gage inverted galvannealed top & bottom channels
  • Projection welded to both face sheets
  • Optional 24 gage galvannealed top caps

Door Application and Usage

Steel Thickness Opening Usage Frequency
SL20 20 Ga (0.8mm) Interior-Cold Rolled Steel Standard Duty
SL20 20 Ga (0.8mm) Exterior-Galvannealled Steel Standard Duty
SL18 18 Ga (1.0mm) Interior-Cold Rolled Steel Heavy Duty
SL18 18 Ga (1.0mm) Exterior-Galvannealled Steel Heavy Duty

Standard Hardware Preparations

  • Mortise Hinge
  • 161 Lock
  • Inactive Leaf ASA Strike Prep with Astragal attached
  • Optional 14 Gage Closer Reinforcement

Standard: mortised and reinforced for

  • Template hinge preparations for 4 1/2” x .134” standard weight hinges or for 4 1/2” x .180” heavy weight hinges. Butt hinge preparations are cut through for non-handed function; spacer plates are furnished for field installation and handing.
  • The cylindrical 161, 61L and mortise 86 lock preps are the most commonly used active leaf preparations. The 4 7/8 (124mm) strike prep is the most commonly used inactive leaf preparation.
  • Optional reinforcements for surface Closers are available
  • Limited hardware applications are available

Door Sizes and ANSI A250.8 Conversions

Series ANSI A250.8 - SDI 100 Edge Construction Options Maximum Sizes Recommended Gage of Frame
Level Model Description Single Pair
Level 1 - Light Commercial
SL20 1 1 Full Flush Visible 3'0" x 8'0"
914mm x 2438mm
6'0" x 8'0"
1829mm x 2438mm
18 Gage [0.042" (1.0mm)]
16 Gage [0.053" (1.3mm)]
Level 2 - Heavy Duty Commercial & Institutional
SL18 2 1 Full Flush Visible 4'0" x 8'0"
1219mm x 2438mm
8'0" x 8'0"
2438mm x 2438mm
16 Gage [0.053" (1.3mm)]

Door Edge Construction
Optional Edge Seams available in the SL Series doors:

  • SL - Standard feature includes visible edge seams with full height interlocked edges