70mm thick with a thermally efficient, argon filled, thoughened Low 'E' double glazed unit giving a whole product U value of 1.6W/m2K - helps minimise heat transfer and lower the carbon emissions. Fully Part F and Part L compliant. Weather tested to BS 6375 Part-1:2009 (with aluminium cill incorporated). Left or Right handed arrangement available. Outward opening (all configurations). Bottom Hung for effortless and unimpaired operational performance. High performance, colour profile matching hardware & handles. Robust Multi-point locking systems on all access doors with lockable shootbolt. Full Height glazed doors - optimises the amount of "borrowed" light. All components pre-machined and drilled - improved speed and ease of on-site assembly.