77IW Open-In Window




Modern contemporary styles and a wide variety configurations delivering high levels of thermal performance through incorporating technologies such as high performance polyamides, insulated centre seals and profile foam insertions. The 77IW system also fully integrates with our curtain walling and door systems.


Design features

  • High levels of thermal performance
  • Multi chamber polyamide thermal breaks, insulated centre seals and foam insertions provide excellent performance
  • Integrates with AluK curtain wall and door systems


  • Wide variety of configurations
  • Available in single or dual colour options, including anodised finishes
  • Range of locking options with patented AluK Groove

Application type

Ideal for residential and commercial applications incl. houses, apartments, villas, public buildings, hospitals, schools and industrial buildings.

  77IW - Open in
U value W/m²K (Double glazing) : 1.2 W/m²K
U value W/m²K (Triple glazing) : 0.8 W/m²K
Uf value W/m²K : 1.4 W/m²K
BRE Green Guide rating : A, B Rated
Air tightness (Pa) : Class 4 (600 Pa)
Water tightness (Pa) : E1200 (1200 Pa)
Wind load (Pa) : C5 (2000 Pa)
Security PAS 24 : PAS 24 & SBD
Certifications : Q-mark
Secured by design : X
Tilt & turn : X
Top hung : -
Side hung : X
Bottom hung : X
Punched openings : X
Triple glazing : X
100 mm restriction : X
Size limits
Side hung (max weight) : 100 Kg
Bottom hung (max weight) : 60 Kg
Dual color option : X
Multi-point locking : X
Locking handle : X
Folding opener : -
Trickle ventilation : X