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.
Metric standard door sizes. Metric sized internal doors are becoming increasingly popular and are most commonly used in Scotland and Europe. The main difference being an increased door height of 2040mm and door thickness of 40mm. 2040 x 526/626/726/826/926 x 40mm.