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.
In the US, door height is usually 6â²8â³ A tall door might be 7â²0â³ or 8â²0â³. Widths vary. Exterior doors are usually 36â³ wide for a single door in a home and this is a minimum for a commercial door - wheelchair access. 32â³ can be found on older homes. Closet door openings, double door openings and sliding door openings are usually 4â², 5â², 6â², 8â² wide and the standard 6â²8â³ tall.