Bifold Exterior Doors
For clear, unobstructed openings, choose expansive bifold exterior doors.
With panels folding to the exterior and stacking at the sides, these door systems intentionally provide the spaciousness you and your clients’ desire. With an optional flush sill detailing helps create a seamless transition from the interior to the exterior, they are popular for restaurant facades, pool enclosures and porches.
Click the links on the left to download product-specific details, specifications, and CAD files.
Data Sheets
All glazing is per project specifications. Duratherm can accommodate most configurations and make-ups from 1/8″ single glazed to a maximum of 1″ security glass. Contact the factory for customized glazing and glass stop configurations.
Clear glass opening: Unit height minus 163/8″. For clear glass width, contact factory.
First digit = total panels. Second and third digit = folding panel groupings. 220, 321, 330, 431, 440, 541, 532, 550, 633, 651, 660, 743, 761, 770
All glazing is per project specifications. Duratherm can accommodate most configurations and make-ups from 1/8″ single glazed to a maximum of 1″ security glass.
Clear glass opening: Unit height minus 15 5/8″, unit width minus 14 1/2″.
Door Panel
Continuous extruded silicone flap gasket set in rebate in doorframe at head and jambs with doubled extruded flap silicone gasket set in rebates at bottom rail of door panels. Engaging the multi-latchpoint lever espagnolettes compresses the weather-strip to ensure a tight seal.
The minimums and maximums shown are intended as guidelines. For applications that exceed these ranges, please contact the factory for assistance.
Width
Maximum Panel: 48″
Height
Maximum Panel: 144″
Weight
Maximum Panel: 250 lbs.
ADA Compliance
Clear-opening sizing based on 32″ clear width requirement.
Minimum unit width: 35 1/2″
NOTE: Standard wood threshold may not meet ADA maximum height requirements.
Consult factory with specific clearance questions
Frame Depths/Leaf Thickness
Leaf thickness: 2 11/16″
Standard frame depth*: 6 1/4″
Minimum frame depth*: 4 3/4″
Maximum frame depth: 10″
*Contact factory for frame depths less than 6 1/4″.
Materials
At Duratherm, you have the flexibility to choose from an extensive selection of material options. We offer a full spectrum of wood choices for both the interior and exterior, along with a variety of powder-coated aluminum clad colors for the exterior.
Bifold Details
Glazing Configurations
All types and configurations are available to use in Duratherm windows and doors. From single monolithic to triple glazing, laminated, curved-in-place, electrochromatic switchable – virtually any type or configuration commercially available – and perhaps even some that are not.
Glazing Methods
Dry Glazing
Specially developed extruded silicone gasket sets the glass by compression. Our proprietary system is long-lived, has low maintenance, and stays water resistant.
Wet Glazing
Our special silicone wet glazing compound bonds to the glass for long-lived sealing. Plus our continuous extruded silicone weatherstrip runs around the frame perimeter, and the seal is not compromised by seasonal expansion and contractions of the sash and frame.