Midrexâs primary business is direct reduction ironmaking. We build DRI plants that work day in and day out, year after. year to provide value for our clients so that they can make. the most of their investment and maximize their profits for. years to come. The MIDREXÂ® Process 2. The MIDREXÂ® Process.
Quick Answer. The maximum interior height of an entry door threshold is 1/2 inch, and up to 3/4 inch on exterior siding doors where it is essential to keep water out, as stated by the United States Access Board. These height limits improve wheelchair access to buildings.
Most local codes require any door in a public or newly constructed building to be at least 6 feet and 8 inches high (2032 mm.) Additionally, a door accessible to those with disabilities must not require a push greater than 5 pounds-force (22.2 Newtons), applied at 30 inches from the hinge, in order to open the door.