Metal Box
Metal boxes are enclosures that protect electronics from damage due to dirt, dust, and heat. They house the electronic components found in many electronic instruments like computers, cash registers, remote controls, and calculators. Metal boxes can be made from a variety of different metallic materials, although steel, stainless steel, and aluminum are the most common.
Most metal boxes are rectangular-shaped, but they can be T-shaped as well. T-shaped designs are most common for handheld devices. Metal boxes, like those found in cash registers and some calculators, can also have an opening at the top for paper receipts or readouts.
Some metal boxes are rated by NEMA, the National Electronic Manufacturers Association. NEMA certifies enclosures based on their application and effectiveness. A majority of the enclosures certified by NEMA are made of steel or stainless steel.