Overhead Concealed Trickle Vent Cover - Company Name -

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

It's a trickle vent If you leave it open, it allows a bit of ventilation even when the main window is closed  A fully recessed plastic slot ventilator, the Titon XS16 Plastic Trickle Vent provides minimal visual intrusion, ideal for new-builds or to be retro-fitted

mystic bear xtrahold™ slot The Simon Trickle Slot vents are the perfect solution for reducing condensation and moisture build up in and around the window by allowing the moisture to 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