Characteristics of smoke exhaust system and selection of exhaust fans

As for designing smoke exhaust system, the requirement and calculation cases of the current fire prevention code only pay attention to determining the air volume of the exhaust fan without mentioning the influence of air pressure and types of fans on smoke evacuation system operation. In line with the example in the code, determines the air volume and the real dimension of duct, calculates the resistance of smoke exhaust system, and makes mode selection for three common use smoke exhaust fans according to the requirement of the code. Analyses the changes of smoke exhaust pipeline characteristics and actual working condition in detail. Concludes the characteristics of smoke exhaust system and some issues worthwhile attention in selecting smoke exhaust fan.