1. First consider the use of local exhaust or overall space ventilation or both, the source of pollution is fixed, local exhaust is used, the source of pollution is not fixed, and the whole space is used for ventilation;
2. Local exhausting determines the amount of exhausted air by the amount of polluting gas generated by the pollution generating source plus the exhausting margin; the overall ventilation, the degree of pollution is determined according to the space volume, the number of air changes is determined, and the amount of exhaust air is calculated;
3. According to the processing method and the position and moving line of the personnel operation, reasonably design the gas collecting hood and the pipeline direction to calculate the pressure loss value;
4. After calculating the wind pressure and wind pressure, estimate the operating cost of the electricity bill. If it is within the budget, if the effect of the ventilation is good, the air volume should be designed more and the running cost will be higher.
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Label: How to determine the amount of dust in the workshop
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