The increased opening size found on our fire escape PVCu sliding sash windows is based on an overall % of the total window size. However, as a general rule the height should be around 450mm. For more information about fire escape options, speak to our product experts or read through the section on fire safety in our building regulations guide.
Heaton Estate, Bradford Road, Bailiff Bridge, Brighouse, West Yorkshire HD6 4BW
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