C.H.I. Commercial Micro-grooved Polyurethane Sandwich: 3212

3212 Polyurethane Insulated Sandwich, 20 gauge


Section Construction

  • 2" Thick Sections
  • 20 gauge steel exterior / 27 gauge steel interior
  • CFC-free Polyurethane-filled sandwich construction - R-Value 17.54**
  • Four evenly spaced micro-grooves run horizontally across each section
  • Thermally-broken to eliminate thermal conduction
  • Gasket seal between sections provide for an extremely tight weather-seal


  • Max standard size 24'2" wide x 16' high

Colors / Appearance

  • White
  • Stock RAL powder-coat option in 188 colors
  • Accents Logos is available as an option for interior and exterior applications
  • Accents Planks is available as an option in cedar, mahogany, natural oak and dark oak

Various accessories and options available.

**R-Values have been calculated in accordance with ASTM C518 standards

Constructed to provide dependable protection from the elements, these garage doors are designed to handle the most rugged commercial applications.

Model 3212 insulated sandwich doors are feature-rich to meet your design and performance requirements with a thermally-broken urethane core, encased in a 20-gauge steel front skin and a 27-gauge back, creating our strongest overhead door. When coupled with this door’s high R-value, you have a premium door available for toughness and environmental friendliness. The steel skins, track, and hardware are all 100% recyclable post-consumer, and the insulating qualities of this door conserve energy making our urethane core doors the right choice to help achieve your sustainable buildings project goals.



  • Features four evenly spaced micro-grooves that run horizontally across each section
  • 20-gauge commercial quality steel exterior & 27 gauge interior skins
  • Thermally-broken to eliminate thermal conduction
  • Gasket seal between sections provide for an extremely tight weather-seal
  • Concealed steel back-up plates run from top to bottom of each section for secure hardware attachment
  • Bottom "U" type astragal is a standard feature


  • Foamed-in-place CFC free polyurethane core permanently bonds the 20-gauge exterior and 27-gauge interior steel skins to form a rigid homogeneous section
  • R value 17.54 (R-value Testing is in accordance with ASTM C518 standards)
20-gauge steel exterior with horizontal micro-grooves
Polyurethane Insulation
Thermal Break


  • Max width 24’2” x 16’ high (Contact Factory for larger sizes)

Colors / Finish:

White Exterior
Optional Colors include RAL powder-coat in 188

Panel Configurations:

  • 18", 21" or 24" high by width of door
Model 3212
Door Height Number of Sections Door Width Panels Across
Thru 8' 4 Thru 9'5" 2
8'3" - 10' 5 9'6" - 12'11" 3
10'3" - 12' 6 13' - 16'5" 4
12'3" - 14' 7 16'6" - 20'2" 5
14'3" - 16' 8 20'3" - 24'2" 6


  • Complete the look of your door with the color and style of Accents.
  • Accents Logos is available as an option for interior and exterior applications
  • Accents Planks is available as an option in cedar, mahogany, natural oak and dark oak


Track Configuration:

  • Tracks are 2' or 3', as specified
  • 12" radius, 15" radius
  • Normal Headroom, Low Headroom, Vertical Lift, High Lift, Incline
  • 20" & 32" radius (2" track & up to 10' high doors only)
Normal Headroom / Standard Lift View PDF
Low Headroom: Front Mount View PDF
Low Headroom: Rear Mount View PDF
Vertical Lift View PDF
High Lift View PDF
Incline View PDF

Mounting Options:

  • Bracket Mount (leg out), Clip Angle Track, Continuous Angle Track
Bracket Mount View PDF
Clip Angle Track View PDF
Continuous Angle Track View PDF
Reverse Angle Mount View PDF

Track Gauge:

  • 2" Tracks - up to 8'-0" high = 17 gauge roll-formed galvanized steel
  • 2" Tracks - 8'-0" 10'-0" = 16 gauge
  • 2" Tracks - over 10'-0" = 14 gauge
  • 3" Tracks - 12 gauge



  • 11-gauge or 14-gauge hinges, as specified


  • 2" or 3" long-stem or short-stem steel ball bearings rollers


  • Top fixtures (min. 12 gauge)
  • Bottom fixtures (min. 13 gauge)

Single or Double Edge Endstiles:


Counterbalance System (Springs)

  • Oil tempered torsion springs are mounted on a cross-header shaft supported by galvanized steel ball breaking end plates and center bracket(s)
  • Springs are calculated for exact door weight, size and trajectory in accordance with ANSI 102 standards for a minimum of 10,000 cycles

    NOTE: May be specified for higher cycles when available

  • Counterbalance is transferred through galvanized aircraft quality cables secured to bottom of the door
Torsion/Spring Assembly with Four Spring Layout, Standard Headroom


  • Manual Operation
  • Motor Operation: Trolley or Jackshaft
  • Chain Hoist Operation
Jackshaft Operation
Troley Operation


Optional Lites / Windows

  • 24" x 6", 24" x 12", or 34"x 16" lites with 1" insulated glass (Clear, Tempered or Tinted)
  • Optional Aluminum Full View Frame to match size and panel layout of steel section

    (Optional open for field glazing, 1/8" DSB, 1/8" polycarbonate, 1/8" tempered glass, 1/4" tempered glass, 1/2" insulated glass or 1/2" tempered insulated)

  • Special glass options available. Contact factory for details.
24" x 12" (shown is 24" section height)
24" x 6" (shown is 24" section height)
34" x 16" (shown is 24" section height)
Full View Aluminum Frame

Optional Accessories

Doors are available with a variety of Specialty Options for specific installation needs. Contact Factory for additional options.

Swing-Up Sectional Post

A perfect answer for openings that are too large for a single overhead door that must accommodate large machinery or equipment on an infrequent basis. Operating on a single pivot point that is designed to swing left or right, it allows the use of one (1) smaller door for everyday requirements and the full opening when needed. See video.

Pass Doors

Whether it's for convenience or necessity, there are circumstances where a pass-through door is requested to provide ingress and egress in an overhead door enclosed opening without having to open the overhead door. C.H.I. can accommodate this need with a state-of-the-art design pass-door option. Available in our urethane core models 3216 and 3212, it’s the ideal choice to solve this need.

Header & Jamb Seals

Seal the perimeter of the opening to provide additional air infiltration and thermal protection.

Certified Windload

Wind can be unpredictable and destructive. This is why C.H.I. Windbreaker Series and iSeries doors are designed, tested, and built to the most rugged specifications. Wind chamber tested to ensure windload resistance, these extra-sturdy designs provide enhanced defense against the elements.

C.H.I. Overhead Doors developed the resilient Windbreaker Series garage doors to protect against high wind conditions. The super-resilient C.H.I. iSeries Impact Approved doors have strength designed to withstand direct collision of projectiles and other windborne debris at high speeds.

Additional Windload Information:

Navigating the complex windload codes and compliances can be a daunting task. C.H.I. sales associated and distributors are able to help you understand the specific codes governing your geographic area. For additional information, these websites offer a great deal of information.

Technical Data Sheets:

  • TDS #168 - Wind Loads on Garage Doors - FAQ
  • TDS #177 - Application of Kd Factor To Garage Door Wind Load Determination Using ASCE 7
  • TDS #178 -Garage Door Wind Load Determination - Effective Wind Area
  • TDS #180 - Wind Load Ratings for Non-Tested Garage Door and Rolling Door Sizes
  • TDS #181 -General Code Inspection Guidelines For Wind Load Rated Garage Doors