Stop your window from closing during heavy winds. The Window Blocker is available in natural wood, as well as whitewash (which includes a primer and a sealer, to protect it from the sun and other elements).
Tested in the Western Cape, where the winds can blow up to 100km per hour. It has three different settings, so that you can decide how far your window has to be open.
It has been designed to fit your typical aluminium windows. There is no installation required, you simply place the Window Blocker in the desired position and enjoy the fresh air coming into your home.