Characteristic: Utilizes CAD optimized design for steady operation and durability; Motor is built-in overload protecting device for safe operation; Aluminum blade for powerful wind force; Stylish outlook, graceful and with durable luster; Three speeds, adjustable angle of pitch for easy-use ; 12"กข16"กข18"กข20"total 4 models; Air volume: 2460-5760m3/h