MFRI's motto could be: "Pipe down, and take a deep breath." The company makes piping systems, and air filter elements through subsidiaries Perma-Pipe, and Midwesco Filter, respectively. It makes pre-insulated specialty piping systems for oil and gas gathering, district heating and cooling as well as other applications. The company also makes custom-designed industrial filtration products to remove particulates from air and other gas streams. Perma-Pipe's specialty piping systems are used on college campuses, military bases, and other large sites. Midwesco provides products and services for industrial air filtration. Its Filtration Products segment supplies filter elements to more than 4,000 user locations.