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This mine air door is made of high-strength steel welding, featuring fire resistance, explosion-proof performance and impact resistance. It can be flexibly adjusted according to the air volume demand of the mine, suitable for coal mine working conditions such as high gas and complex geology. Produced in strict compliance with national standards, the product supports both manual and automatic control modes, with easy installation and low maintenance cost, providing reliable guarantee for mine ventilation safety.link:https://www.rlycn.com/mining-ventilation-system/mine-door-control-devices/mine-door-drive-system.html