The DL302 design has louvers in both the upper and lower portion of the door. With two large columns of louvers, plenty of air can get through this door. Our substantial louvers are made a full 3/8 thick by 1 5/8 wide. They can be used for both interior and exterior door projects. Our Dutch louver doors are often used around pools, closets and storage rooms inside the home or on mechanical rooms. Tops and bottoms can be mixed and matched. Each door is handcrafted to your exact width and height specifications. Interior doors are typically made 1 ½ thick. Exterior doors are usually 1 ¾ and up to 2 ¼ thick depending on the size of your door. Every Dutch door design can also be made into a double door unit. Do not hesitate to contact us with any questions you have on your project!