High Performance Grilles are designed for 300, 000 cycles usage with an approximate average operating speed of 24 inches per second to open and 12 inches per second to close. They are well suited for parking garages and other applications where traditional roll-up grilles do not adequately meet the demands for very high frequency usage or the desire for higher speed operation.Model PG features a springless barrel design, enhanced heavy-link aluminum grille curtain, innovative hinged steel guide system with replaceable UHMW wear strips, 2 HP motor operator with variable speed controller and soft startstop, dual monitored sensing systems, and more.