Trickle vent installed into the head of the box frame
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![Trickle vent installed into the head of the box frame Trickle vent installed into the head of the box frame](https://londonsashwindows.com/wp-content/uploads/2019/01/Trickle-vent-installed-into-the-head-of-the-box-frame-673x1024.jpg)
Trickle vent installed into the head of the box frame allows easy opening and closing. Notice how air drops directly by the window creating a heat barrier that'll help considerably in preventing condensation on sash windows