Rolling even if the grid is turned off, it will not give the feeling of tightness in a box, still breathable light. And can be used with the alloy aluminum rolling doors, ventilation and prevents prying eyes. {Note: the doors there are referred to as grid shutter doors, light air shutter doors, light air shutter (whose name is too long), reticulate roller shutter door (not all grid shutter doors is a network as a whole, either on the upper or middle of open hole