Folding Window

What Is a Folding Window?

A folding window, also called a ​bi-fold or accordion window, is a multi-panel system where sashes fold back on themselves to create a wide, unobstructed opening. Combining panoramic views with operable flexibility, these windows enable seamless indoor-outdoor transitions, maximize daylighting, and adapt to diverse architectural needs. Ideal for patios, commercial pass-throughs, and modern homes, they feature high-performance glazing, multi-point locks, and low-maintenance materials like aluminum or uPVC.

Key Features & Benefits

  1. Accordion Operation:
    • Panels slide and stack neatly along tracks, opening 100% of the span without fixed mullions.
  2. Energy Efficiency:
    • Thermal-break frames, Low-E glazing, and precision seals achieve U-values as low as 0.24 W/m²K.
  3. Customizable Design:
    • Choose panel quantity, stacking direction (left/right), ADA-compliant sills, and finishes (powder-coated aluminum, wood, composites).
  4. Security:
    • Multi-point locks and reinforced glass options resist forced entry; impact-rated models suitable for hurricanes.
  5. Low Maintenance:
    • Modular panels allow individual removal for cleaning; aluminum frames require only periodic wiping.

ABOUT Folding Window FAQ

Unlock the master sash, slide it along a track, and subsequent panels fold on piano-style hinges, stacking tightly at the jamb. No additional props needed—rollers and guides ensure smooth movement.

  • Aluminum: Slim, durable, corrosion-resistant with powder-coated finishes.
  • uPVC: Affordable, energy-efficient, low-maintenance.
  • Wood/Composite: Natural aesthetics with enhanced thermal performance (requires more upkeep).
  • Double/triple Low-E glazing with argon gas.
  • Tempered/laminated safety glass, acoustic panels, decorative tints, or impact-resistant options for high-wind zones.

Multi-point locks on the master sash and secondary “dog-bolt” locks on intermediate panels. Optional anti-lift blocks and top/bottom locking rods enhance security.

  • Residential: Enclosed patios, sunrooms, kitchen pass-throughs, balcony enclosures.
  • Commercial: Restaurant serving windows, retail storefronts, stadium boxes, café enclosures.
  • Panel widths: 18″–36″; heights up to 8 ft.
  • System spans exceed 50 ft with reinforced support beams and engineered sills.

Thermal-break frames and insulated headers/jambs prevent thermal bridging. U-values as low as 0.24 W/m²K with Low-E glazing.

  • Lubricate rollers, hinges, and locks annually with silicone spray.
  • Clean aluminum/uPVC frames with mild detergent; remove panels for deep cleaning.

Folding windows offer 100% clear span vs. sliders’ 50%. Better airflow and views but higher cost and complex installation.

Yes! Friction stays or adjustable arms hold sashes at fixed angles. Vent-latches or restrictors enable secure partial ventilation.

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