SLimfold

The original pre-finished steel bifold door.

Slimfold® developed the Pre-Finished Steel Bifold over 60 years ago and has become the leader in the industry.
SlimFold® doors are prefinished and are offered in five timeless designs that blend beautifully with any decor.
SlimFold® is also available in four mirror designs.

Innovative and Speciality

SlimFold® is constantly innovating door designs. The furnace doors are perfect for laundry, furnace, or air handler (HVAC) closet doors. These doors are side-hinged full louvered doors constructed with 25 gauge cold rolled steel or A40 galvannealed Steel. Available in standard colors of Bright White, Ivory or Prime for field painting and are easy to install.

Slimfold® offers 5 outstanding and innovative mirror door designs, from sliders to bifolds and the new single panel overlay door. There is a design to fit every decor.

All mirror panels are 1/8” (3mm) float plate glass mirror *with a laminated backing to prevent shattering (4mm on 7’0” heights and taller). 

*Note:4175 has two layers of 2.5mm safety backed glass.

Installation is easy. With just a few tools and a little time, Slimfold® Bifold or Mirror Doors can transform a room from plain to beautiful. All hardware is included.

Durability

Slimfold® doors are engineered for beauty, quiet operation and long-life. They are carefully manufactured to provide years of maintenance-free use. The electrostatically-applied enamel is standard and galvanized steel is available for areas of high humidity.

Finishes

SlimFold doors are available with a top-of-the-line factory prefinish.  Save time and money with a strong long lasting prefinished frame.  Choose from one of Dunbarton’s many standard colors or select a custom color of your choice. Mirrored Stiles and Rails are available in Bright White, Arctic Silver, Satin Silver, or Satin Chrome depending on your mirror choice.

 

SlimFold is finished in a state-of-the-art paint conveyor line with electrostatically applied, baked-on enamel.  This ensures complete coverage of the frame with a “best in the industry” paint finish.  No exposed edges of the steel or hardware cutouts compared to our competition.  Dunbarton also offers an option of A40 galvannealed steel that combined with our factory paint system gives maximum rust protection.

The Dunbarton factory-applied paint finish meets or exceeds the 500-hour salt spray test per ASTM–B117-97.  This is four times the requirement of hollow metal frames per SDI (Steel Door Institute) of 125 hours.

Dunbarton Painted finishes also passed a 700-hour humidity test per ASTM–D1735-87.

Dunbarton_4175_Slimfold

SlimFold Technical Details

Tabs are best viewed on a desktop or tablet

SLIMFOLD BIFOLD

Bifold:

Specifications:

• MATERIAL:
      24 gauge cold-rolled steel with an alternate hot-dipped coating of zinc-iron alloy (galvaneal) recommended for coastal areas with high salt content
• REINFORCEMENTS:
      Reinforced with 4″ wide stiffeners welded to banks and flanges of panels.  
• HARDWARE:
      All mounting hardware shall be factory installed. Rods to be zinc plated cold rolled steel with yellow dichromate finish. Patented weight-bearing pivot rods to be 9/16” (14mm) diameter, adjustable screw type, and securely held in position by nylon rod clamp assemblies. Guide rods and upper pivot rods shall be 1/4” (6mm) in diameter, spring-loaded for easy self-alignment, and securely held in position by self-retaining nylon sleeves.
• TRACK:
      The top and bottom tracks are .055 mill finish aluminum. 

Bifold Diagram:

Bifold Diagram Dunbarton

Track

Specifications:

• MATERIAL:
      16 gauge
• STANDARD:
      Full track: Goes from wall to wall
• OPTIONAL: 
     Bottomless: L-Shaped Bracket attaches to wall and floor leaving open area in the middle.

Handles:

Specifications:

• MATERIAL:
      16 gauge, 18 gauge (standard) and 20 gauge cold-rolled steel per ASTM A1008M-16 steel  
• DOOR THICKNESS:
      For use with 1/-3/4” thickness doors (steel or wood).
• WALL SIZE: 
     4″ to 13″
• STOP HEIGHT: 
     5/8″
• HINGE REINFORCEMENTS:
      Prepared with three 4″, 4-1/2″ standard weight 10 gauge hinge reinforcements or 5″ heavyweight hinge reinforcements – see complete list on hinge prep tab 
• STRIKE REINFORCEMENTS:
      Prepared with 12 gauge 4-7/8″ adjustable ASA Strike Prep Standard – see a complete list of options on strike reinforcement prep tab
• FINISHING:
      Prefinished in eight standard colors. See the complete list on the Colors tab.
• FIRE RATING:
      Embossed 90 minutes neutral and positive pressure fire label; wood or stud steel. See Fire Testing Tab.

SLIMFOLD MIRRORS

4050 Mirror - Steel Framed Sliding Mirror Door with Top Roller:

Specifications:

• STYLE DETAILS:
      Top hung single sheep rollers for smooth and quiet operation. The snap-in bottom guides are virtually jump-proof.
• MATERIAL:
      Stile and rails are extruded anodized aluminum 
• SIZE LIMITATIONS:
     Height: 6’8″ only
     Width minimum: 36″
     Width maximum: 80″
     *Custom sizes available
• MIRROR:

      3mm safety-backed mirror standard, 4mm safety-backed mirror for heights greater than 7’0″ and widths greater than 3’0″. 
• HARDWARE:
      All mounting hardware shall be factory installed. Rods to be zinc plated cold rolled steel with yellow dichromate finish. Patented weight-bearing pivot rods to be 9/16” (14mm) diameter, adjustable screw type, and securely held in position by nylon rod clamp assemblies. Guide rods and upper pivot rods shall be 1/4” (6mm) in diameter, spring-loaded for easy self-alignment, and securely held in position by self-retaining nylon sleeves.
• TRACK:
      The top and bottom tracks are .055 mill finish aluminum, prefinished to match doors.

4260 Mirror - Steel Framed Sliding Mirror Door with Bottom Roller:

Specifications:

• STYLE DETAILS:
      Adjustable top L-Guides for greater vertical adjustment allows for out-of-square opening adjustments. 
• MATERIAL:
      Stile and rails are extruded anodized aluminum 
• SIZE LIMITATIONS:
     Height: 6’8″ only
     Width minimum: 42″
     Width maximum: 96″
     *Custom sizes available
• MIRROR:
    3mm safety-backed mirror standard, 4mm safety-backed mirror for heights greater than 7’0″ and widths greater than 3’0″. 
• HARDWARE:
      All mounting hardware shall be factory installed. Latch is adjustable ball tension catch at top. One piece 1-3/4″ deep top track and integral fascia.

4100 Mirror - Aluminum Overlay Door:

Specifications:

• STYLE DETAILS:
     Available in both single and paired configurations. It overlays the door and does not require an exact fit. Features a magnetic catch system.
• MATERIAL:
      Stile and rails are extruded anodized aluminum 
• SIZE LIMITATIONS:
     Width minimum: 16″
     Width maximum: 36″
• MIRROR:

      3mm safety-backed mirror standard, 4mm safety-backed mirror for heights greater than 7’0″ and widths greater than 3’0″. 
• HARDWARE:
      All mounting hardware shall be factory installed. Rods to be zinc plated cold rolled steel with yellow dichromate finish. 12 gauge pivot brackets eliminate track.

4175 Mirror - Double-Sided Pre-hung:

Specifications:

• STYLE DETAILS:
      Pre-hung in wood jamb using three, 3″ hinges constructed of finger joint pine. 
• MATERIAL:
      Stile and rails are extruded, anodized aluminum 
• MIRROR:

      Two layers of 2.5mm safety-backed mirror 
• HARDWARE:
      All mounting hardware shall be factory installed. Latch is adjustable ball tension catch at top.

4050 Diagram:

4050 Exploded Dunbarton

4100 Diagram:

4100 Exploded Dunbarton

4175 Diagram:

4175 Dunbarton

4260 Diagram:

4260 Exploded Dunbarton

Vented Closet Panel | Furnace Doors

Vented Closet Panel:

Vented Closet Panel Dunbarton

Vented Closet Panel

Specifications:

• STYLE DETAIL:
     The Vented Closet Panel is a door panel only featuring a full louver design designed as a single-finish-sided panel with a simple ball catch.
• RECOMMENDED USAGE:
     Laundry, Furnace, Water Heater or Air Handler
• MATERIAL:

     Inner and outer panels of 25 gauge cold-rolled steel with an alternate A40 hot-dipped coating of zinc-iron alloy (galvaneal) recommended for coastal areas with high salt content
• FINISH STANDARDS:
     Meets 500 hour salt spray test (ASTM B117-97) and 700 hour humidity test (ASTM D1735-87)  
• HARDWARE:
     Two SlimFold pivot rods and one ball catch supplied with door.

Furnace Doors:

Specifications:

• STYLE DETAIL:
     Smooth or textured finish available, no jamb required, and available in 20″, 22″, or 24″ width. All doors meet ventilation standards.
• RECOMMENDED USAGE:
     Model 100: Water heater or pantry area
     Model 250/325: HVAC area; meets most HVAC free area space requirements
• MATERIAL:

     24 gauge cold-rolled steel with an alternate hot-dipped coating of zinc-iron alloy (galvaneal) recommended for coastal areas with high salt content
• REINFORCEMENTS:
     Reinforced with three 3″ wide, 24 gauge cold-rolled steel stiffeners, welded to back and flanges of the panel (12 welds per stiffener)  
• FLAME SPREAD:
     All doors meet requirements per ASTM E84-94 as tested by Warnock Hersey.
     Model 250: Flame speed index= 0; Fuel contribution index= 0, Smoke developed index= 20
     Model 325: Flame speed index= 0; Fuel contribution index= 0, Smoke developed index= 15
• HARDWARE:
     Two hinges with six #8 wood screws, one-panel doorknob with a screw.
• INSTALLATION:
     All HVAC/Furnace mount in finished opening with no frame required!

COLORS

Colors may vary by screen! Color chips are available upon request. Click here to order.

Bypass | Swing Door Colors

BrightwhiteDunbartonRediFrame

Bright White

IvoryDunbarton

Ivory

Note: Leather “No Fingerprint” Finish Optional on all steel bifold doors.

Mirror Bifold Colors

BrightwhiteDunbartonRediFrame

Bright White

4050, 4260

arcticsilverDunbartonSlimfold

Arctic Silver

4050, 4260

SatinChromeDunbartonSlimfold

Satin Chrome

4175

SatinChromeDunbartonSlimfold

Satin Silver

4100

Primer*

PrimeDunbartonRediFrame

Prime

**Prime Gray not intended for top coat. Primer not available for mirrors.

Technical Information

For a complete listing of technical data, click here.
For a complete listing of MSDS, click here.