Exhaust fan exhaust fan parameters _ _ _ Model exhaust ventilation machine manufacturers Company Name: Henan Hong Blower Co., Ltd. Company website: www.henanhongjifengji.com company sales hotline: 0394-7892627 15518086290 QQ: 445528270 impeller through the application, scroll research shells and other elements, and further improve manufacturing precision, and strive to make all kinds of fan efficiency an average of 5% to 10%. Some have adopted a centrifugal fan Impeller efficiency increased by 10%; the emergence of large-scale centrifugal fan using a larger impeller diameter and narrow width, high speed and efficient structure, which is the highest efficiency of up to 87%; efficiency Higher axial fan, maximum efficiency reached 92%. So that the product itself is energy-saving products. Regulate energy efficiency in operation, in addition to the use of more advanced variable pitch, a variety of methods speed two-speed motor, hydraulic coupling and AC motor, the large fan speed the emergence of new energy-saving device - multi-stage hydraulic variable speed drives