Leaking window vent

How to retrofit or install a window vent, trickle vent to a window slot vent How to retrofit or install a window vent, trickle vent to a upvc window to help with condensation window slot Welcome to the HandleStore range of Trickle Vents for the replacement of existing, tired, missing or broken slot vents found on double glazed

window slot vent However, they are typically designed so the doorwindow can be left closed while the trickle vent is kept open at all times for continuous