Louver Doors We manufacture louver doors in a wide range of configurations, including venting or closed, movable or fixed designs. Louvers can be combined with glass or panels and arranged in virtually any layout to suit your design requirements. The primary detail that defines the appearance of a louver door is slat spacing. Our most popular configuration features 3/8″-thick slats spaced 1 3/4″ on center. Slats are available with either radiused or square edges. Please refer to our detail pages for the full range of available options.