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.
Standard Door Sizes Generally, entry door widths of 30 inches, 32 inches and 36 inches are considered standard and are readily available in home improvement and hardware stores. The standard height of an entry door is 80 inches, and the standard thickness is 1 Â¾ inches.