FOUR SEASONS ALUMINIUM ROOF VENTS The features and benefits of K2 Aluminium Roof Vents are: Fully sculptured aluminium sash and PVC outer frame Dedicated sashes to suit 24/25mm and 35mm glazing with polycarbonate or glass Dedicated sash bracket in chrome or brass finish to complement opening mechanism No aluminium sections on the inside, therefore no need for thermal break and eliminates the risk of condensation Sash glazing directly seals onto the outer frame making water ingression impossible Opening mechanism screws into dedicated aluminium reinforcemnet Drainage facility within the sash Double weather sealing Concealed hinge allows sash removal even after glazing Available glazed and unglazed with manual and electronic opening options Thermostat and rain sensor control units K2 Aluminium Roof Vents are tested to: Over 300 pascals with air and water, with no recorded leakage Water tightness with 2 litres per sq metre, per minute. Equating to a rainfall of almost 5 inches per hour Weather tightness BS 6375 pt 1 Air permeability BS 5368 pt 1 Water tightness under static pressure BS 5368 pt 2 Wind resistance BS 5368 pt 3