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Advanced Inward Opening System

The Advanced Inward System is a solid metal casement inspired by the continental preference for inward opening windows, allowing for the use of exterior shutters and improved access for cleaning and maintenance, whilst retaining the fine sightline of our Advanced window system. The frame incorporates double weather seals and integral drainage and is designed to take 18mm Krypton filled double glazed units. In most cases windows can be installed and glazed from inside the property. A range of decorative ironmongery compliments the handcrafted, bespoke nature of the product.

System Features

Traditional Bead Option
Contemporary Bead Option
Double Glazing (18mm)
Inward Opening
Side Hung Unit
Bottom Hinged Hopper Windows
Hinge and Bead on Outside
Equal Leg Profile
Vertical and/or Horizontal Glazing Bars
Leaded or Plain Units
Double Weather Seal
Outer Frame Drainage
High or Difficult to Access Areas

System Drawing

Opening Frame

Advanced inward opening system drawing

Fixed Frame

Advanced inward fixed system drawing

Recommended Design Limits

Side Hung Casement

Max O/a Width 650mm
Min O/A Width 300mm
Max O/A Height 1700mm

Fixed Lights

Max O/A Width 1200mm
Max O/A Height 2400mm


U-value performance based on an 18mm double glazed unit made up of 4mm float/10mm 90% Krpyton filled cavity/4mm Planitherm total + with warm edge spacers.

Fixed casement overall value 1.8W/m2K
Centre pane value 2.0W/m2K
Centre pane value 1.1W/m2K

When incorporating a genuine Georgian bar add 0.4 to the U-value.

U-values calculated in accordance with BS EN ISO 10077-1:2006 based upon a single fixed light sample 1230mm x 1480mm and a single opening light sample 1230mm x 1480mm. Inclusion of glaze bars or equal leg will affect performance.