TPI Corporation provides a range of electrical heating products. The company offers a variety of installation services. It serves various clients in the commercial and residential sectors. TPI Corporation also provides a range of ventilation, lighting and temperature control products. It operates Markel Products Company, Raywall Comfort Conditioning Products and Redd-i Products Company. The company distributes duct, portable and infrared heaters, as well as maintains a location in Ohio. TPI Corporation manages a division, Fostoria Industries, which has received the ISO 9001: 2000certification. Additionally, the company offers a variety of switches and controls used in aeronautical industry applications.