[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. 
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.