Grime fighter Donaldson is cleaning up the industrial world. The company makes filtration systems designed to remove contaminants from air and liquids. Donaldson's engine products business makes air intake and exhaust systems, liquid-filtration systems, and replacement parts; products are sold to manufacturers of construction, mining, and transportation equipment, as well as parts distributors and fleet operators. The company's industrial products include dust, fume, and mist collectors and air filtration systems used in industrial gas turbines, computer disk drives, and manufacturers' clean rooms. Donaldson operates in 44 countries worldwide and has 42 manufacturing plants.