ALT W72HS Hidden sash window

ALT W72HS hidden sash windows meet the highest architectural requirements with thermal insulation and the greatest possible transparency (the glazing area of W72HS windows is 18% larger than those of ALT W72 classic window).

Secure and durable operation of ALT W72HS windows is provided by the high quality of the used profiles, hardware and accessories.

Due to the minimum visible width of the profiles, as well as the same visible width of the fixed light and the active sash, the glazing area of the window with the hidden sash is much larger than the glazing area of classic window with the same window dimensions. The installation of ALT W72 HS windows allows you to improve the local lightening of the premises, make it visually spacious and more comfortable.

The ALT W72HS windows with maximum thermal insulation and hidden sash are well combined with ALUTECH Door systems as well as with Sliding and Curtain Wall systems.

Up to 2 450 mm Max sash height
Up to 1 600 mm Max sash width
50 mm Max infill unit thicknesss
Up to 150 kg Max sash weight
>=1,05 W/m2*K Thermal insulation, Uw (EN ISO 12567-1:2011)
PAS 24:2016 (class W) Burglar resistance
class 4 (600 Pa) Air permeability (EN 1026:2000, EN12207:1999)
class E1200 (1200 Pa) Water tightness (EN 1027:2000, EN 12208:1999)
class C5 (2000 Pa; 1/300) Wind load resistance (EN 12211:2000, EN 12210:1999)
up to 41dB Acoustic insulation (EN ISO 10140-2:2011, EN ISO 10140-4:2011)
Fixed light
Сombination window
Integrated window
Parallel-sliding window
Tilt and turn window (Double sash)
Tilt and turn window (Fixed window with a sash)
Tilt and turn window (Single sash)
Window wall
Fabrication benefits
  • Easy and timesaving fabrication due to universal punch-tools and equipment.
  • Universal corner cleats for stock optimization.
  • Easy and simple profile processing.
  • Easy integration into ALT F50 curtain wall system.
powder coating


  • any RAL-colour according to Qualicoat;
  • exclusive collections (Futura, Precis, Anodic);
  • variety of surface types (glossy, matte, textured);
  • innovative antimicrobial BIO-coating option.


  • conformance to Qualanod standard;
  • 9 standard colours;
  • possibility to choose different surface treatments (chemical etching, bead blasting, brushing).
wood-grain effect


  • conformance to Qualicoat standard;
  • 5 woodgrain options.