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How to retrofit or install a window vent, trickle vent to a upvc window to help with condensation

Trickle vents are background ventilators integrated into window frames and door frames to allow a 'trickle-feed' of constant airflow from the outside to an Greenwood EA 2500 Trickle Slot Vent White Colour For Upvc Window Ventilation This is the Greenwood 2500EA trickle vent which is one of the smallest

bbc slot Trickle vents are used extensively in the UK and Europe integrated into window frames to provide minimum ventilation requirements for naturally ventilated It's a trickle vent If you leave it open, it allows a bit of ventilation even when the main window is closed