Why is there a vent in the window AC? Should it be kept

website window slot vent Filter Products · Window Material Aluminium; Composite; PVCu; Timber · Vent Type Glazed-in; Slot · Vent Material Metal; Plastic · Fit Flush; Surface Mounted window slot Order Casement Window - Trickle Window Slot Vent Set Inside & Out - 400mm - 3180mm²EA

window slot vent Welcome to the HandleStore range of Trickle Vents for the replacement of existing, tired, missing or broken slot vents found on double glazed  A 550mm long, 22mm wide Greenwood trickle vent Includes internal and external canopies which neatly cover routed slots to comply with building regulations   Order Casement Window - Trickle Window Slot Vent Set Inside & Out - 400mm - 3180mm²EA

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