CONSTRUCTION Low profile Built in "wind bars" Full width vision panel(s) available No springs, rollers or counterweights UHMW rub bars to reduce frictionMAINTENANCE No special tools required "Lock-down" type hinges Guide tracks permit easy access to fabric Delivers long service lift with minimal maintenanceOPERATION High speed operating systems Direct drive system Safety sensor edge Auxiliary hand crank operation NEMA design motors, brakes and high efficiency reducer UL labeled control panel