18 "20" 26 "30" промышленный стены

18"20"26"30"industrial wall fan:Details:1.Optimized impeller structure; 2.Large air volume and low noise; 3.Motor with a long service life; 4.Available options:Stand type and Wall type; 5.18", 20",26",30"four different size; 6.Three speeds,oscillating angle adjustable,two or three blades; 7.Suitable for heat-stroke prevention and cooling-down temperature in mineral factories,workshop and warehouse ect,for ventilation and improving environment;