We typically begin with Rectangular Door Units, as they are the most cost-efficient frame type. Once the frame is selected, you can then choose the product style that best suits your needs. Double doors are a popular choice for many applications. Available in configurations ranging from all-panel to all-glass, they offer outstanding versatility. Adding a transom can introduce natural light into a foyer—especially when paired with panel doors—and can soften the overall appearance of an entryway. Sidelites may also be incorporated into double units when a wider opening calls for increased glass area.