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.
The standard height for both exterior and interior doorways is 80 inches. In the construction industry, this is often stated as 6/8, which means 6 feet 8 inches. Although this height is standard, actual door openings are sometimes slightly smaller or larger, such as 79 or 81 inches.