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Reduce Condensation, Damp & Mould By Providing Air Flow 5 Single Brown Trickle Vents Each Easy To Fit Vent Include Inside Part, Outside Part, End Caps & Screws Suitable for uPVC Double Glazed, Timber, Aluminium Windows & Doors Heavy Duty Can Be Used To Replace Existing Vents 263mm Length Providing An Impressive 2087 mm2 Air Flow Tested In Accordance With BS EN 13141-1:2004 External Dimension: 263 x 17 x 24mm Internal Dimension: 263 x 17 x 14mm