The MaxSeal® Wall model comes standard with a solid aluminum trim-to-fit tunnel so that you will have a custom fit tunnel through your wall. We include a section of indoor/outdoor carpeting to line the tunnel. All doors are made upon order, this allows us to offer the maximum amount of variations to make this the perfect pet door for your home. The insulated Security Panel used to lock off the pet door is the strongest in the industry. Your door can be made with this panel sliding in from the top, left side or right side. This choice in direction is optimal for customers who might have clearance issues when closing off the door. While we offer a single or dual flap version, we recommend the dual flap as it will provide the best sealing and insulating quality. Our flaps are the best in the industry and will last even in the harshest environments. Optional High Wind magnets are available for customers who live in extremely windy areas. These optional magnets will create a wind proof seal.