http://bookmarkinglife.club/story.php?title=cooling-system-on-dc-fans-axial-ventilations-4 14. Axial Fans in the Deep: Ventilation Challenges in Mining and Tunneling Ventilation is an absolute necessity and a primary safety concern in underground operations such as mining, tunneling, and subterranean construction[9]. Toxic gases (like methane and carbon monoxide), dust particles, and the heat generated by machinery must be continuously removed and replaced with fresh, breathable air[11]. Thu, 26 Mar 2026 12:51:24 UTC en