Fan uses: 9-19,9-26-pressure centrifugal fan, generally used for blacksmiths furnace and high-pressure forced ventilation, can be used for transportation of materials, air and non-corrosive, not spontaneous, non-explosive, non-volatile, non- gas viscous substances. Medium temperature usually does not exceed 50 ℃, the maximum does not exceed 80 ℃, the medium contained in the dust and hard particles should not exceed 150mg / m3. Fan Type: 1, the fans are single inhalation, usually № 4,4.5,5,5.6,6.3,7.1,8,9,10,11.2,12.5,14,16, a total of 13 machine numbers. 2, right-handed and left-handed fan usually made of two types. 3, the export position of the fan exit angle to the cabinet said, "left" and "right" fan casing made of 0 degrees, 45 degrees, 90 degrees, 135 degrees, 180 degrees, 225 degrees. Fan structure: a fan mainly by the impeller, housing, air inlet, brackets and other components. 2, 9-19 type fan impeller blades is 12, is a pre-curved. Impeller outer edge of the diffuser must not exceed the maximum circumferential velocity 140m / s, after forming the impeller, the static and dynamic balance, it is smooth. 3, the case with ordinary steel plate welded into a snail-shaped shell as a whole. 4, air inlet made convergent streamline the overall structure, bolted on the front cover. 5, the transmission group consists of spindle bearing housing, couplings. Spindle is made from high quality steel, the overall structure of the bearing housing. Rolling bearing, bearing with grease lubrication.