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 IBC states that the door opening should be of a sufficient height and width for occupants to enter and exit, and the dimensions should be: 1  Commercial Door Width: IBC requires the minimum door width to be 32 inches (2.67 feet), with a maximum of 48 inches. However, there are exceptions. For example, doors in medical facilities, where beds are moving in and out of rooms, must have a minimum width of 41.5 inches.