APA 80 Hidden Sash Window System
The APA 80 Hidden Sash Window System offers the ultimate balance of contemporary design and high thermal performance for modern homes.
Its refined, slim-frame aesthetic conceals the sash completely within the outer frame, creating a clean, uninterrupted exterior appearance while maximising the amount of natural light entering each room.
Developed for exceptional energy efficiency, the APA 80 system uses advanced insulation materials and precision-engineered aluminium profiles to deliver outstanding thermal and acoustic performance. The result is a quiet, comfortable, and energy-efficient living environment with minimal maintenance and lasting style.
Ideal for high-performance residential projects, the system combines elegant design with robust construction, ensuring reliable operation and durability in even the most demanding climates
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.
