American Air Filter Company, Inc. (AAF) is a global leader in clean air solutions and is a subsidiary of Daikin Industries, Ltd. AAF designs, develops, and manufactures air filtration solutions for commercial, industrial, cleanroom, transportation, and nuclear power applications. The company was founded in 1921 and is headquartered in Louisville, Kentucky. AAF has operations in 22 countries and employs over 3,000 people worldwide.