Hormann's Speed-Guardian 5000 is a viable alternative to four-fold doors for renovation and new construction. With a lower initial cost, the Speed-Guardian 5000 costs an average 25 percent less than four-fold doors, and it's fast! The Speed-Guardian 5000 opens completely in less than 3 seconds - Four-folds open completely in 7 seconds (based on 14'w x 14'h opening). A compact footprint enables the 5000 to fit into existing building dimensions, while the four-fold door requires 54" of additional building space (one side of the opening - times 2 if doors will be on two sides of building) for necessary clearance significantly adding to building construction costs. The overall cost of ownership is much lower than comparable models, as the 5000 is designed to operate up to 1 million cycles plus with minimal maintenance, and an industry-leading 5 year warranty defines confidence that your investment will perform for many years to come. For more information, visit http://www.hormann-flexon.com/products/speed-guardian-5000-interior-or-exterior-rigid-panel/