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Thermally broken window ventilators installed on top of the aluminium, timber or PVC window frame Slotvents are installed on window frames where a slot (10,

Window Trickle Slot Vent 263mm White for uPVC Double Glazing & Timber Windows Reduces Condensation, Damp & Steam in Windows Fully Adjustable : :

window slot vent A 550mm long, 22mm wide Greenwood trickle vent Includes internal and external canopies which neatly cover routed slots to comply with building regulations

pg slot 888th Twin Slot Night Vent Keep Plate For Use With Window Dead Lock