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.
Accessible Entry Doors. To meet the ADA accessibility standard, doors must have a clear width of 32 inches from the face of the door to the opposite stop. If the building has a separate entry vestibule with double doors, there must be 48 inches between the two doors.ccessible Entry Doors. To meet the ADA accessibility standard, doors must have a clear width of 32 inches from the face of the door to the opposite stop. If the building has a separate entry vestibule with double doors, there must be 48 inches between the two doors.