Donaldson Co., Inc. engages in the manufacture of filtration systems and replacement parts. It operates through the following segments: Mobile Solutions, Industrial Solutions, and Life Sciences. The Mobile Solutions segment is involved deals with replacement filters for both air and liquid filtration applications and filtration housings for new equipment production and systems related to exhaust and emissions. The Industrial Solutions segment focuses on industrial air filtration, industrial gases, industrial hydraulics, power generation and aerospace, and defense business units. The Life Sciences segment consists of bioprocessing, food and beverage, medical device, vehicle electrification, microelectronics and disk drive business units. The company was founded by Frank Donaldson Sr. in 1915 and is headquartered in Minneapolis, MN.

CECO Environmental Corp. engages in the provision of engineering technology and solutions. It offers services in the field of environment, energy, fluid handling, and filtration. The firm operates through the following segments: Engineered Systems and Industrial Process Solutions segment. The Engineered Systems segment serves the power generation, hydrocarbon processing, water/wastewater treatment, oily water separation and treatment, marine and naval vessels, and midstream oil and gas sectors. The Industrial Process Solutions segment serves the broad industrial sector with solutions for air pollution and contamination control, fluid handling, and process filtration in applications such as aluminum beverage can production, automobile production, food and beverage processing, semiconductor fabrication, electronics production, steel and aluminum mill processing, wood manufacturing, desalination, and aquaculture markets. The company was founded by Phillip DeZwirek in 1966 and is headquartered in Addison, TX.