http://bookmarksknot.club/story.php?title=cooling-system-on-dc-fans-axial-ventilations-9 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]. Fri, 10 Apr 2026 13:00:57 UTC en