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aluminium front door aluminium patio door aluminium sliding door aluminium windows approved document building regulations Burglary-resistant Burglary resistance double casement door double track EN 1627 frameless glass extension glass-box extension glass floors glass room glazing company glazing installer glazing project low threshold opening types planning permission resistance class Resistance Classification reynaers aluminium Reynaers CP 130 reynaers masterpatio reynaers windows safety glass schuco aluminium windows single track steel doors steel entrance door steel framed windows steel windows thermal insulation thermal performance timber windows tricle vents triple track u-value ventilation walk-on glass windows and doors windows opening types wooden windows