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.
Choosing the right size door is a breeze. Andersen Â® storm doors conveniently attach to the exterior trim of an existing entry door. Find the door size you need by following these easy steps. 1 Height Measure for height (H) from the sill to the underside of the exterior trim at the top of the door. H _________________ Record your door height. 2 Width Measure the width at the top (W1), center (W2) and bottom (W3) of the door opening.