Description FHC Aspire™ Insulating Glass Entrance Systems together with the "VDS" Vertical Door Stile System (U.S. Patent Numbers 11,299,928 and 11,187,323) are both designed, engineered, and manufactured in the U.S.A. at the company’s Southern California facility. These new products bring next level industry standards to air, water infiltration management, and thermal performance meeting the nation’s ever evolving energy and building codes.