The frame has specific sized holes machined out of it covered by the trickle vents on the inside and outside of the window.
Small window trickle vents.
These openings allow a small amount of air to pass from one side of the window to the other enabling you to benefit from the fresh air without having to open your window or door.
If you re replacing windows with trickle vents the ventilators should be no smaller in geometric open area than the existing ventilators.
Trickle vents now form part of the building regulations.
These are small discreet plastic or metal modules that are housed at the top of a door or window frame.
What are the alternatives to trickle vents.
If this isn t known habitable rooms should have trickle ventilator of 5000mm2 equivalent area and wet rooms should have 2500mm2 equivalent area.
Trickle vents have the following advantages.
They remove stale air from your property.
Trickle vents are used extensively in the uk and europe and are integrated into window frames to provide minimum ventilation requirements for naturally ventilated spaces.