A trickle vent is a very small{Quantify|date=August 2009} opening in a window or other building envelope component to allow small amounts of ventilation in spaces intended to be naturally ventilated when major elements of the design - windows, doors, etc., are otherwise closed. Trickle vents are used extensively in the UK and Europe and are integr...
Found on
http://en.wikipedia.org/wiki/Trickle_vent
A ventilation system built into the top of the window frame.
Found on
https://www.eurocell.co.uk/glossary
No exact match found.
