Ventilation upstairs Ä-house

[Kenta-63]

I need tips and advice on how to handle ventilation on the upper floor. According to Ä-hus, an air supply ventilation must be arranged by installing an air supply vent above one of the windows in each gable end. How should one proceed?
Grateful for answers.

 

[sanne78]

buy 2 fresh 90.. installation instructions are included.. I have installed 2 myself just like you need.