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The minimum wind speed of the 1 ç¡ chamber type stope shall not be less than 0.15m/s;
2 roadway type stope should not be less than 0.25m/s;
3 The electric ramp and the secondary crushing roadway shall not be less than 0.5m/s;
4 The working surface of the trackless loading equipment shall not be less than 0.4m/s.
2. The calculation of the required air volume for the standby working surface shall comply with the following provisions:
1 The spare working face that is difficult to be sealed shall be the same as the required air volume of the mining face;
2 The spare working face that can be temporarily sealed should be calculated according to 1/2 of the required air volume of the working face .
3. The calculation of the required air volume for the driving face should meet the following requirements:
1 When calculating according to the dust removal wind speed, the wind speed of the roadway should not be less than 0.25m/s ;
2 The required air volume for digging the working face can be selected according to Table 1 . 
4. The calculation of the required air volume for an independent ventilation chamber shall comply with the following provisions:
1 The working space of the underground explosives warehouse, the broken chamber, the main shaft discharge chamber, and the bucket loading chamber shall be calculated separately;
2 The diverticulum with large heat dissipation of electromechanical equipment shall be calculated according to the calorific value of the operation of electromechanical equipment;
3 The charging chamber should be calculated according to the hydrogen concentration in the return air stream being less than 0.5 %.
1. The required air volume of the working face should be calculated according to the required air volume of the dust exhaust wind speed; the dust exhaust wind speed should meet the following requirements:
Table 1