Fire exhaust fan for a better understanding of the users are aware of its characteristics and advantages, are now increasing penetration of this fan, so the technical requirements should have a certain mastery of all aspects in terms of fire exhaust fan has Many benefits are not careful during the assembly process is likely to cause trouble, so users must be aware of the importance can be assembled, followed by a look at it. Under normal circumstances, we learned that the fire exhaust fan casing assembly, should the rotor axis alignment as the base Huai cabinet position and axial impeller intake port between the intake port and the housing and radial clearance is adjusted to the range of equipment technical documents, as well as to check the anchor bolts are tightened. In addition, we should be particularly noted that the gap between the value of its non-provision of technical documents such as equipment, general axial clearance should be 1 800 impeller diameter, radial clearance should be evenly distributed, its value should be outside the impeller diameter 1,5 / 1000-3 / 1000 (small diameter by whichever is greater), and finally to understand the particular adjustment sought clearance smaller value to increase the efficiency of fire exhaust fan series. I hope that the user can point to keep in mind, you can better avoid some of the problems during fire exhaust fan casing assembly. 

palabras clave: Fire exhaust fan, exhaust fan fire, fire exhaust fan,