CONCEPT™ Panels Hoffman CONCEPT™ panel is taller and wider than the equivalent NEMA panels. It fits solid back and double hinged Concept™ enclosures. The panel offers protection to gauges, dials and control equipment in the enclosures in harsh conditions. 14 or 12 gauge steel Painted white or have a conductive finish Panels have a formed flange along any side that is longer than 22.2" (564 mm) Hoffman - Panels and Panel Accessories