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Pressureless air doors are used in every crosscut between underground intake and return airways, as well as between main intake and return airways. They require minimal force to open, eliminate the need for additional reverse air doors, and can close automatically after personnel or vehicles pass through. They are currently considered a relatively ideal type of air door for coal mines in China.

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Beijing Aokun Energy Co., Ltd. is an innovative new energy technology company dedicated to the global energy transition and sustainable development. Guided by our mission to "make clean energy accessible to all," we focus on core sectors including solar photovoltaics, wind power generation, energy storage systems, and smart microgrids. We provide global clients with comprehensive, full-lifecycle green energy solutions spanning R&D, equipment manufacturing, and project operations.