ventiatim fans ventiatim fans Louver-type fans uses CAD/CAM the excellent turning ... shape, also noise has been well controled.Louvered window is made of aluminum alloy, with special pneumatic ... open and shutting sructure to ensure the window completely open and shut,it can be in ... , flader frame, protecting net, bracing cage, louvered window, electyic machine drives the wind blader to cause air ...