The oxygen concentrator is available in a number of different specifications and can also be customized to meet different customer needs. The housing is made of high strength carbon steel and coated with plastic materials for a pleasing exterior. The oxygen concentrator can be equipped with 2 or 12 towers of PSA molecular sieve units for diverse applications. It comes with a number of spare parts, including air compressors, molecular sieves, refrigerated air dryers, flow meters, condensers and fans.