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 Inside Door Sizes. The most common width for interior doors is 32 inches. The International Residential Code does not require interior doors to be as large as the main entry door in a house, but it still sets minimum height and width requirements. Thus, most standard interior doors are the same height, and come in widths ranging from 28 to 32 inches.