Aluminum storefronts are offered in narrow stile, medium stile, and wide stile configurations. When combined with optional rails and intermediates (horizontal and/or vertical), these door systems are flexible enough to meet most design and hardware requirements. The availability of multiple glazing stops allow for the use of a broad range of glazing products. Fabrication and installation labor costs have always been a decisive factor in selecting framing systems for storefront projects. Aluminum doors and storefronts may be interior or exterior glazed and are compatible with most United States aluminum entrance doors.