Equipment enclosure with self-sealing multilayer wall structure

A wall for an electrical equipment enclosure, the wall comprising:

• a rectangular frame;
• a first rectangular panel attached to the rectangular frame around a periphery thereof;
• first, second, third, and fourth flanges disposed at respective ones of first, second, third and fourth sides of the frame;
• a first rib member extending between opposite sides of the rectangular frame;
• a second rectangular panel parallel to the first rectangular panel, attached to the first rib member, and having respective first second, third, and fourth peripheral portions that face respective ones of the first, second, third, and fourth flanges;
• and
• a second rib member between the first and second rectangular panels and extending parallel to the first rib member.

A wall for an electrical equipment enclosure, the wall comprising:

• an outer panel;
• an inner panel having a first side facing a chamber of the enclosure and a second side facing the outer panel;
• and
• at least one flange spaced apart from the outer panel and facing at least one peripheral portion of the inner panel and configured to prevent movement of the at least one peripheral portion of the inner panel towards the outer panel, wherein the peripheral portion of the inner panel is not attached to the flange.