The Spindle Opener for Roof Window allows manual ventilation in your Royal Victorian Greenhouse. A spindle opener is great in windy locations because it secures the window and you can decide when to open and close it.
The spindle opener is attached to the frame and the roof window. By spinning the pole, you can open and close the roof window as much as you want. It is reliable in unfavorable weather situations preventing windows from smashing and shattering window panes.