Underground Mining The original PosiDrive Rubber Door is perfectly suited for underground mining applications and high pressures. For over 30 years, the PosiDrive doors have been operation in some of the toughest mining operations around the globe. The PosiDrive mechanism enables the door to be driven open and driven close in extreme winds and high pressures. It is especially effective in underground ventilation doors and harsh underground industrial operations where rapid, high-speed, & high-performance opening reliability are essential. Rubber Door Curtain - The PosiDrive Doors incorporate a ¼” SBR and high tensile strength Rubber that is suited for the rugged environment in the mining industry. Reliability - The ASSA ABLOY Rubber Doors are designed for extreme cycles and extreme conditions. The PosiDrive system helps avoid unplanned downtime from accidents or extreme environmental conditions. Heavy Duty Construction - Thick ¼” structural steel side frames are built to withstand the rugged conditions and are designed to last in demanding applications. Safety - Fail Safe reversing edge automatically reverses if contact is made. Continuous windlock design protect workers from extreme wind and debris. Lower Total Cost of Ownership - The Design and Durability will help avoid costly downtime. We provide the industry leading warranties: Limited Lifetime Warranty on Rubber Curtain, 5 years or 100,000 cycle warranty on all drive systems, and 2-year warranty on all other electrical and mechanical components.