Welcome to AluK United Kingdom Menu

77IW Open-In Window

Product description

The new 77IW (Open-in) window system is designed to meet the most demanding performance requirements, including thermal, weathering and security - ideal for any building, whether refurbishment or new build, high rise or low rise.

Design features

  • High levels of thermal performance
  • Thermal polyamides, insulated centre seals and foam insertions
  • Integrates with AluK curtain wall and door systems


  • Wide variety of configurations
  • Available in single or dual colour options, including anodised finishes

Application type

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

  77IW - Open in 77IW HI - Open in
U value W/m²K (Double glazing) 1.4 W/m²K 1.2 W/m²K
U value W/m²K (Triple glazing) 1.1 W/m²K 1.0 W/m²K
BRE Green Guide rating A, B Rated A, B Rated
Acoustic performance (dB) Rw = 45 (-2;-6) dB Rw = 45 (-2;-6) dB
Air tightness (Pa) Class 4 (600 Pa) Class 4 (600 Pa)
Water tightness (Pa) E1200 (1200 Pa) E1200 (1200 Pa)
Wind load (Pa) C5 (2000 Pa) C5 (2400 Pa)
Security PAS 24 X X
Certifications Q-mark Q-mark
Secured by design X X
Tilt & turn X X
Top hung - -
Side hung X X
Bottom hung X X
Punched openings X X
Triple glazing X X
100 mm restriction X X
Size limits    
Side hung (max weight) 100 Kg 100 Kg
Bottom hung (max weight) 60 Kg 60 Kg
Dual color option X X
Multi-point locking X X
Locking handle X X
Folding opener - -
Trickle ventilation X X

Download collateral.

Please click here to download supporting collateral for this product which includes the following;

  • Brochures
  • Data sheets
  • Wall charts
  • Profile and section drawings
  • Installation guides
  • BIM models

We use cookies for statistical purposes and to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are accepting the use of cookies on the aluk website. However, if you would like to, you can change your cookies settings at any time. More