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 height is 79.5 inches. When measuring for entry and interior doors, youâll need three measurements. Accuracy is very important. Measure the width and height of your old door and round this number up to full inches. As an example, you would round up a measurement of 79.5 inches to 80 inches. Next, measure the jamb width. Measure from the back of the interior trim to the back of the exterior trim. An accurate measurement here means your new pre-hung door will fit flush to the wall without jamb extensions.