Trickle Vent Guide
We understand that many people struggle with how many vents are needed for there rooms. This is a handy guide to help you though.
The easiest place to fit a trickle vent after the window has been installed is in the head of and opening sash. This enables you to drill quite easy without ruining the wallpaper and getting grief from the other half. With that in mind you need to count how man openers you have in the room
The picture below shows what we refer to as the Opener (or Sash)
For Example In the drawing below there are 2 openers, Take a look at yours and click the button that corresponds with the same number.