Principles should be paid attention to when designing local exhaust hood of axial flow fan

1, local exhaust hood should be as far as possible surrounded or near the harmful passive, so that the harmful passive limitation and smaller local space. The inspiratory range should be reduced as much as possible for easy capture and control. 2. The direction of suction air flow of exhaust hood should be consistent with the direction of pollution air flow as far as possible. Contaminated inhaled air is not allowed to pass through a person's breathing area. The design should fully consider the location and scope of the operator. 4. Exhaust Hood should be simple in structure, low in cost, easy to install and maintain. 5. The configuration of local exhaust hood should be in harmony with the production process, so as not to affect the process operation. 6, to avoid and reduce as far as possible interference air flow and cross-hall, supply air flow on the impact of the inspiratory air flow.