An evolutionary development from W20, W40 offers continuity of style with the same casement sightlines as W20 but the 40mm wide profiles permit double glazing with 26mm thick units. The insulating glass units are drained and ventilated in accordance with modern best practice and gasket glazed to ensure consistent neatness and reliability of seal. In addition to improved thermal performance, weathertightness is ignificantly enhanced and fittings can be less obtrusive with variable geometry hinges, friction pivots and multi-point locking cremone bolts concealed within the profiles. W40 achieves the Secured by Design standard.

Features of W40
  • "Stepped leg” design.
  • Material thickness up to 5 mm.
  • Very compact profiles with minimal depth and sightlines.
  • Self-adhesive non-shrinking gaskets.
  • Low emissivity double-glazing up to 27 mm.
  • Choice of different glazing beads.
  • Appropriate for heavy-duty corrosion protection.