The Four-Fold XT door system is designed with heavy-duty construction, enabling it to function under high cycle and other severe conditions. Opening horizontally and in less than seven seconds, this means faster and safer utilization for your vehicles. Not only does the Four-Fold XT offer the advantages of speed, durability, low maintenance, and fully visible operation, it also requires no interior bay space, making it ideal for retrofitting existing stations or reducing square foot cost on new stations. Does your application have custom clearance requirements or non-standard opening sizes? – no worries, you have options with the Four-Fold XT. For more information go to: http://doorengineering.com/Products/Commercial_Industrial/Four_Fold.html