1., the closed source of harmful materials, we should first adopt airtight measures, as far as possible to seal it up, with the smallest amount of exhaust air to achieve the best control effect.
2., when the harmful sources can not be completely sealed, the outer Ji'nan smoke hood can be set, and the outer cover should be as close as possible to the harmful source.
The type and structure of 3. Ji'nan hood should be determined according to the nature and characteristics of harmful substance source, do cover the negative pressure or the face velocity uniformity, the exhaust volume (per unit time cover amount of air expelled from the Ji'nan smoke) should be to prevent the harmful substances to escape working environment through the principle of calculation can be used to determine the measured the data and empirical data, or through the model experiments.
4. the smoke hood of Ji'nan shall be able to capture harmful substances released from harmful sources
The utility model can not be discharged into the working environment, so that the concentration of harmful substances in the working area meets the national hygienic standard and catches the harmful substances with less energy consumption.
5. Ji'nan exhaust hood must be strong and durable.
6., when the smoke hood of Ji'nan can not be set near the harmful source or the distance from the cover to the harmful source is large, the suction hood can be provided. The suction hood should be used with caution when it is used to remove objects or cut off airflow from the harmful sources.
7. the hood of the smoke hood of Ji'nan should be in the direction of the air flow, so that harmful air flows into the hood directly. But the exhaust lines are not allowed to pass through the worker's breathing belt.
8. external hoods, receiving hoods, and suction hoods shall be arranged to avoid interference with airflow. The installation of smoke hood in Ji'nan should be convenient for workers' operation and equipment maintenance.
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