You need a width kit and a height kit to the appropriate sizes together with one accessory kit for each double glazing pane. Also use a window stay where you wish the window to remain fixed open occasionally for ventilation or cleaning
SELECTING YOUR GLAZING MATERIAL
White Aluminium Secondary Glazing may be used with glass of 4mm or 3mm thickness, or alternatively 4mm, 3mm or 2mm acrylic sheet.
4mm glass generally gives the best results, but if your window is below 800mm or otherwise exposed to impact we recommend you use acrylic or toughened glass for safety reasons. Acrylic is widely available in 2mm, 3mm or 4mm thickness
You can order them here Acrylic Glazing Panels
Do not exceed the following maximum sizes for any single pane
Side hinged 3.66 sq metres
Top hinged 5.49 sq metres
This system fits to the flat face of the wooden window surround. Allow a minimum of 32mm all round to accept the fittings.
Where two hinged panes are to be used on the same window, allow at least 50mm where the two panes meet.