The inspecting specification on safety technique for underground air compressors 煤矿井下空气压缩机安全技术检验规范
2.
Article 17 mining enterprises inspect the poisonous and harmful substances at the work sites and the percentage of oxygen in underground air to ensure that they meet safety requirements 第十七条矿山企业必须对作业场所中的有毒有害物质和井下空气含氧量进行检测，保证符合安全要求。
3.
Heating ventilation and dusting . air condition and smoke exhauting engineerings for industry and civil buildings design for underground air defence engineerings heat supply plan and design for a city or a region 工业与民用建筑供热采暖工程通风除尘工程，空调与防排烟工程地下人防工程设计，城市自供热规划与设计。
