The ventilation flap simply lets air circulate through your home. To close the ventilation flap, place your hand around the control bar, and press it up gently 1 time.
[header] How to close a velux window [title] Push the top control bar upwards to close the ventilation flap. [step] Velux windows have a natural ventilation feature, where you pull the top control bar down 1 time to open the ventilation flap. The window can remain closed, or you can open it if you wish.