A trickle vent is simply a slot is cut in the window and a vent cover is placed on both sides of it. The airflow created through this vent can be adjusted through a valve.
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Trickle vents Gallery
Greenwood’s trickle vents
Greenwood’s trickle vents are open and close in a direct manner.
Titon’s trickle vents
Can be adjusted to change the direction of airflow.