Condensation on the windows, damp or mould, or a broken vent to replace? Trickle vents let a small, steady flow of fresh air into the room while the window stays closed and locked. We stock window trickle vents from Greenwood (S Vent, F Vent, L Vent and 8000HD), Titon (Trimvent Select), Yale (SlotVent, including noise-reducing versions) and Simon (Framevent), plus Titon clip fix kits.
Choose a vent that fits the slot in your window frame and gives at least the same airflow (equivalent area) as the one you are replacing.
Measure the overall length of the inside vent and compare it with the length shown on each product listing.
Measure the length and width of the slot cut through the frame, so the new vent covers it and lines up.
The EA figure, such as 2500EA or 4000EA, is the airflow in mm². Match or exceed your existing vent. The 8000HD vent is a high airflow model.
Many vents come as an inside vent plus an outside canopy (hood). Check whether you need one part or both.
A trickle vent is a small vent fitted to the top of a window frame, usually with a slider or flap to open and close it. It lets moist air out and fresh air in without opening the window, which helps reduce condensation, damp and mould, especially in bedrooms, kitchens and bathrooms.
If you live near a busy road, a noise-reducing trickle vent such as the Yale SlotVent noise reduction models lets air in while cutting down outside noise compared with a standard vent.
To replace a vent, unclip or unscrew the old inside vent and outside canopy and fit the new ones over the same slots. If the new vent is a different length, check it still covers the slots fully. Fitting a vent to a window without slots means routing slots through the frame, which is best done by a window installer.
Yes, if your window already has slots. Most vents clip or screw over the existing slots.
Equivalent area: a measure of how much air the vent lets through, in mm². A higher number means more airflow.
They help a lot by letting moist air escape all the time. Keep them open, especially in bedrooms and wet rooms.
Yes. We stock the Titon XS13/XC13 clip fix kit.
Browse all window vents: trickle vents and rotary vents and window ventilators.
Not sure which trickle vent you have? Send us a photo of the vent and the slot in the frame, with a tape measure alongside, and we'll match it for you.
Send us a photo to identify your partMonday to Friday, 8:30–12:30 and 13:00–15:30
