Reversible Aluminium Casement Windows
Shaanxi SGL Doors&Windows Technology Co., Ltd. is one of the most reliable manufacturers and suppliers of reversible aluminium casement windows in China, also supports customized service. Please feel free to wholesale high quality reversible aluminium casement windows for sale here from our factory. If you have any enquiry about pricelist and quotation, please feel free to email us.
Why Reversible Windows for Your Project
180° Full Rotation
Patented pivot hinge allows the sash to rotate a complete 180° while remaining securely attached to the frame. Both interior and exterior glass surfaces become accessible for cleaning from inside the building - eliminating the need for external cradles, rope access, or cherry pickers.
Dual-Lock Safety System
Automatic safety locks engage at both 90° (ventilation) and 180° (cleaning) positions. The sash cannot detach or fall during rotation. All hardware tested to EN 13126-3 with 10,000-cycle durability certification for commercial-grade reliability.
High-Rise Optimised
Designed specifically for buildings where external maintenance access is impractical or dangerous. Complies with UK HSE guidance on working at height by eliminating the need for external cleaning operations. Ideal for residential towers above 6 storeys.
Secure Ventilation
Restrictor stay maintains a 100 mm minimum secure ventilation gap compliant with UK Approved Document F. The restrictor disengages for full 180° cleaning access. Acoustic trickle vents (15-25 dB) integrate into the frame head for background airflow.
Concealed Pivot Hardware
Pivot hinges are fully concealed within the frame profile, maintaining a clean architectural appearance. No visible hinges or stays when the window is closed. Compatible with 60 mm and 70 mm thermal break frame systems for energy efficiency.
Document F Compliant
Pre-configured to meet UK Building Regulations Approved Document F (Ventilation) and Document K (Protection from falling). Tested and certified for use in social housing, student accommodation, and NHS healthcare facilities where compliance documentation is mandatory.
The Reversible Advantage: Safety Meets Compliance
Standard casement windows swing outward 90° and expose only the interior glass surface for cleaning. For the exterior surface, building owners must arrange external access - cradles, rope descent, water-fed poles, or cherry pickers. In high-rise buildings above 6 storeys, this becomes prohibitively expensive and hazardous. UK HSE statistics show that 25% of fatal construction falls involve window cleaning operations.
Reversible windows solve this permanently. The sash rotates 180° on a central pivot axis, bringing the external glass surface fully inside the room. A single operative can clean both sides of the glass from a standing position without any external equipment. The dual-lock safety system ensures the sash is secured at every position - it cannot fall, detach, or rotate unexpectedly. For social housing providers, local authorities, and commercial landlords, this eliminates ongoing maintenance access costs while improving tenant safety.
Key Features
1. Patented 180° Pivot
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Central pivot axis with sealed bearing race allows smooth rotation through 180°. The sash weight is balanced by calibrated friction hinges, so rotation requires minimal force regardless of sash size. No lubrication required for 50,000 cycles.
2. Auto-Engaging Safety Locks
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Spring-loaded safety bolts automatically engage at 90° and 180° positions. A deliberate two-action release (lift + rotate) is required to move between positions - preventing accidental operation by children or vulnerable occupants.
3. 60/70 mm Thermal Break Frame
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Compatible with both 60 mm (standard) and 70 mm (high-performance) thermal break aluminium systems. PA66 GF25 polyamide thermal barrier with 24 mm insulation zone. U-values from 1.4 W/m²K with double glazing.
4. Acoustic Trickle Vent Integration
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Frame-head trickle vents with labyrinth baffles provide 4,000 mm² equivalent area background ventilation while attenuating external noise by 15-25 dB. Complies with Part F without the security risk of open windows.
5. Concealed Hardware Aesthetic
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All pivot mechanisms, hinges, and stays are concealed within the frame cavity. The visible face shows only clean aluminium lines - no external stays, no visible friction arms, no compromise on architectural appearance.
Ideal Applications
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High-Rise Residential Towers
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Social Housing Blocks
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Student Accommodation
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NHS Hospitals & Clinics
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Care Homes & Assisted Living
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Commercial Office Buildings
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Hotels & Serviced Apartments
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Education Facilities
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Frequently Asked Questions
Q: How does a reversible window differ from a standard casement window?
A: A reversible window features a patented pivot mechanism that allows the sash to rotate a full 180° while remaining securely attached to the frame. This enables both glass surfaces to be cleaned from inside the building. Standard casement windows only swing outward 90° and cannot expose the external glass surface for cleaning.
Q: Is the 180° flip mechanism safe for high-rise buildings?
A: Yes. SGL reversible windows incorporate a dual-lock safety system with automatic engagement at 90° and 180° positions. The sash cannot detach from the frame at any point during rotation. All hardware is tested to EN 13126-3 standards with a 10,000-cycle durability rating.
Q: What is the maximum sash size for reversible casement windows?
A: Standard reversible sashes accommodate openings up to 1,200 mm × 1,400 mm (W×H). For larger openings, we recommend combining multiple reversible units with a fixed transom or coupling mullion. Custom sizes are available upon request with engineering review.
Q: Do reversible windows meet UK Building Regulations for ventilation?
A: Yes. When fitted with a restrictor stay, SGL reversible windows achieve the 100 mm minimum secure ventilation gap required by Approved Document F (Ventilation) of the UK Building Regulations. The restrictor can be disengaged for full 180° cleaning access.
Q: Can reversible windows accommodate trickle vents?
A: Yes. Acoustic trickle vents (15-25 dB attenuation) can be integrated into the frame head without compromising the reversible mechanism. This provides background ventilation compliant with Part F even when the window is fully closed.
Project Case Studies
We provide one-stop door and window solutions for individual buyers, contractors, renovation companies, and more.
Our address
No. 2 Group, Fumiao Village, Laojun Town, Hantai District, Hanzhong City, Shaanxi Province, China
Phone Number
+86 13335450021
sgl-factory@sgl-doors-windows.com
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| Parameter | Specification |
|---|---|
| Frame Profile | 60 mm or 70 mm thermal break aluminium |
| Rotation Mechanism | 180° pivot hinge with dual-lock safety |
| Max Sash Size (W×H) | 1,200 mm × 1,400 mm (standard); custom upon review |
| Max Sash Weight | 60 kg (standard hardware); 80 kg (heavy-duty option) |
| Glass Configuration | 5+20A+5 Low-E argon (standard); 6+16A+6 acoustic; triple glazed |
| U-Value (Double Glazed) | 1.4–1.6 W/m²K |
| Air Tightness | Class 4 (EN 12207) |
| Water Tightness | Class E900 (EN 12208) |
| Wind Resistance | Class C5 / 3,000 Pa (EN 12210) |
| Hardware Standard | EN 13126-3, 10,000-cycle tested |
| Safety Lock Positions | 90° (ventilation) and 180° (cleaning), auto-engaging |
| Restrictor Stay | 100 mm minimum gap, disengageable, child-safe |
| Trickle Vent Option | Acoustic 15-25 dB, frame-head integrated |
| Surface Finish | Polyester powder coat RAL/BS; Anodised AA25 |
| Glazing Bead | Internal, continuous EPDM gasket |
| Installation | Face-fixed or reveal-fixed; suitable for concrete, timber, steel openings |
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