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AeroClean Technologies, Inc., an interior space air purification technology company, provides air purification solutions for hospitals and other healthcare facilities. It offers interior air sterilization and disinfection products for the eradication of harmful airborne pathogens, including COVID-19. It provides Purgo, an air filtration machine; and Purgo Lift, an air purification solution for elevators and other wall-mount applications. The company was formerly known as AeroClean Technologies, LLC. AeroClean Technologies, Inc. was founded in 2011 and is headquartered in Palm Beach Gardens, Florida.

CECO Environmental Corp. provides industrial air quality and fluid handling systems worldwide. It operates in two segments: Engineered Systems Segment and Industrial Process Solutions Segment. The company engineers, designs, builds, and installs systems that capture, clean, and destroy air- and water-borne emissions from industrial facilities as well as fluid handling, gas separation, and filtration systems. It offers dampers and diverters, selective catalytic reduction and selective non-catalytic reduction systems, cyclonic technology, thermal oxidizers, filtration systems, scrubbers, and water and fluid handling equipment, as well as plant engineering services and engineered design build fabrication. The company markets its products and services to natural gas processors, transmission and distribution companies, refineries, power generators, industrial manufacturing, engineering and construction companies, semiconductor manufacturers, compressor manufacturers, beverage can manufacturers, metals and minerals, and electric vehicle producer companies. CECO Environmental Corp. was incorporated in 1966 and is headquartered in Dallas, Texas.

Donaldson Company, Inc. manufactures and sells filtration systems and replacement parts worldwide. The company operates through three segments: Mobile Solutions, Industrial Solutions, and Life Sciences. Its Mobile Solutions segment provides replacement filters for air and liquid filtration applications, such as air filtration systems; liquid filtration systems for fuel, lube, and hydraulic applications; exhaust and emissions systems and sensors; indicators; and monitoring systems. This segment sells its products to original equipment manufacturers (OEMs) in the construction, mining, agriculture, aerospace, defense, and transportation markets; and to independent distributors, and OEM dealer networks. The company's Industrial Solutions segment offers dust, fume, and mist collectors; compressed air and industrial gasses purification systems; and hydraulic and lubricated rotating equipment applications, as well as gas and liquid filtration for industrial processes. This segment sells its products to various distributors, OEMs, and end-users. Its Life Sciences segment provides micro-environment gas and liquid filtration for food, beverage, and industrial processes; bioprocessing equipment, that includes bioreactors and fermenters; and bioprocessing consumables, such as chromatography devices, reagents and filters, and polytetrafluoroethylene membrane-based products, as well as specialized air and gas filtration systems for applications, including hard disk drives, semi-conductor manufacturing and sensors, battery systems, and powertrain components to OEMs and various end-users. The company was founded in 1915 and is headquartered in Bloomington, Minnesota.

Fuel Tech, Inc. provides boiler optimization, efficiency improvement, and air pollution reduction and control solutions to utility and industrial customers worldwide. The company operates through Air Pollution Control Technology and FUEL CHEM Technology segments. The Air Pollution Control Technology segment offers technologies to reduce nitrogen oxide (NOx) emissions in flue gas from boilers, incinerators, furnaces, and other stationary combustion sources; NOxOUT and HERT selective non-catalytic reduction systems; selective catalytic reduction systems comprising ammonia injection grid, and graduated straightening grid systems; I-NOx systems; ESP Processes and Services; ULTRA technology; and flue gas conditioning systems. The FUEL CHEM Technology segment provides programs to improve the efficiency, reliability, fuel flexibility, boiler heat rate, and environmental status of combustion units by controlling slagging, fouling, corrosion, opacity, and acid plume, as well as the formation of sulfur trioxide, ammonium bisulfate, particulate matter, sulfur dioxide, and carbon dioxide through the addition of chemicals into the furnace using TIFI targeted in-furnace injection technology. This segment offers its FUEL CHEM program for plants operating in the electric utility, industrial, pulp and paper, waste-to-energy, and university and district heating markets; and the owners of boilers, furnaces, and other combustion units. Fuel Tech, Inc. was incorporated in 1987 and is headquartered in Warrenville, Illinois.

Perma-Pipe International Holdings, Inc., together with its subsidiaries, engineers, designs, manufactures, and sells specialty piping and leak detection systems. It offers insulated and jacketed district heating and cooling piping systems for energy distribution from central energy plants to various locations; and primary and secondary containment piping systems for transporting chemicals, hazardous fluids, and petroleum products, as well as engages in the coating and insulation of oil and gas gathering and transmission pipelines. The company also offers liquid and powder based anti-corrosion coatings for external and internal surfaces of steel pipe, including shapes like bends, reducers, tees, and other spools/fittings that is used in pipelines for the transportation of oil and gas products and potable water. It has operations in the United States, Canada, the Middle East, Europe, India, and internationally. The company was formerly known as MFRI, Inc. and changed its name to Perma-Pipe International Holdings, Inc. in March 2017. Perma-Pipe International Holdings, Inc. was incorporated in 1993 and is headquartered in Spring, Texas.