APA 80 Hidden Sash Window System
Overview
The APA 80 Hidden Sash Window is designed for modern residential projects that require clean lines, strong performance and refined style. This system hides the sash completely within the outer frame, creating a smooth, uninterrupted external appearance. The slim-frame look helps maximise natural light and enhances both interior and exterior design.
Modern Architectural Design
The concealed sash design supports a minimalist architectural finish. Because there is no visible sash on the outside, the façade appears sleek and uniform. This makes the APA 80 Hidden Sash Window ideal for contemporary homes, high-end apartments and renovation projects where visual impact is important.
The slim sightlines also help increase the glazed area, making rooms feel brighter and more open. This suits homes that want to take advantage of natural daylight while maintaining modern aesthetics.
Thermal & Acoustic Performance
The system is engineered to deliver strong thermal performance. It uses high-quality insulation materials and precision-engineered aluminium profiles to reduce heat loss. These features contribute to a more energy-efficient living environment and can help improve the overall building rating.
Because of its design, the APA 80 Hidden Sash Window also provides excellent acoustic performance. It reduces external noise and supports comfortable indoor living, which is especially helpful in urban or busy environments.
Durability & Low Maintenance
The aluminium profiles offer long-term durability and require minimal maintenance. Homeowners benefit from a window system that performs reliably even in harsh or exposed climates. The overall construction ensures smooth operation and dependable performance throughout its life cycle.
Ideal Applications
The APA 80 Hidden Sash Window works well in:
- Modern residential developments
- High-end apartment schemes
- Refurbishment projects
- Contemporary extensions
- Homes seeking slim, elegant window lines
It combines architectural elegance with robust performance, making it suitable for demanding residential environments.
For more information regarding our APA 80 Hidden Sash Window System range, get in touch with us here.
- Frame depth: 80 mm thermally broken aluminium system
- Visible section: 66 mm (frame + sash) for ultra-slim sightlines
- Thermal performance: Uw values as low as 0.8 W/m²K (depending on glazing configuration)
- Air permeability: Class 4 (EN 12207) Water tightness: Class E1950 (EN 12208) Wind resistance: Class C5 (EN 12210)
- Finishes: Single or dual-colour powder coating with over 200 RAL colours available in single or dual finish
- Double or triple glazing up to 42mm in thickness
- Acoustic insulation: Up to 46 dB (according to glass specification)
- Opening options: Side hung, tilt & turn, or fixed-light combinations
- Can be pre-assembled in-house saving installation time/cost
- Opening options: Side hung, tilt & turn, or fixed-light combinations
- Matching rebate doors available
- Identical sight lines throughout
| Thermal transmittance | Uw ≥ 0.71 (W/m²K) | |
| Acoustic insulation | Rw up to 46 dB | |
| Air permeability | Class 4 | |
| Water tightness | Class 1650 | |
| Wind resistance | Class C5 | |
| Sections | Frame 80 mm, Sash 80 mm | |
| Polyamide bar length | 45 mm | |
| Profile thickness | Window 1.9 mm | |
| Glazing | Max. 51 mm, Min. 36 mm | |
| Maximum sash weight | 160 kg |
*Whole window U values are a combination of the frame and glazing thermal performance and as such will vary with the specification of glass utilised. Please consult with the APA technical team for more specific performance information.
