How are the NEMA 3R I-Line enclosures, such as catalog HC4259WP mounted to a wall?

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Issue:
What is the procedure to mount an I-Line weatherproof enclosure to a wall?

Product Line:
I-Line panelboards

Environment:
Installation

Resolution:
The enclosure has a mounting channel/rail on the top, which hangs the unit from the top end. (A separate piece of mounting rail to mount on the wall surface first is included with each enclosure.) In addition, at the bottom of the enclosure, there are two mounting feet to secure the lower half of the box.