MANN+HUMMEL Filtration Established from two textile companies during the war-torn 1940s. Today, eight decades later, MANN+HUMMEL has grown to become the world's leading filtration expert, employing more than 21,000 people at over 80 locations, with sales totaling 3.8 billion euros (in 2020). MANN-FILTER was there from the very beginning and is still part of the company today as a globally valued brand. Read about MANN+HUMMEL origins