YX9-35 type 5C, 6.3,8C, 8D is applicable 1t / h, 2t / h, 4t / h boiler supporting developed for supporting its performance to fully meet the needs of the boiler. Especially prominent is running noise conditions only 76dB (A), lower than the environmental limits 9dB. Solve the noise is high, inadequate performance Boiler Fan prominent contradictions exist, the ideal product supporting current boiler. The fan is made of a single inhalation. Machine No. 4.5C, 6.3C, 8CD three kinds, with 1t / h, 2t / h, 4t / h boiler. From one side of the face rotation group, the impeller rotates clockwise, called cis Tornado aircraft, to shun said impeller rotates counterclockwise, called inverse Tornado aircraft, in order to indicate the reverse. Mainly by the chassis fan, impeller, air inlet, front cover, turn the group (of which there are less N0.6.3C bracket, there are more than adjust the door) and other components.