APC Filtration is now part of Rensa Filtration. Our Engineered Filtration Products (EFP) group is focused on manufacturing and testing mission-critical, high-efficiency air filtration products to OEM customers around the world. In addition to APC, Rensa’s EFP unit includes Custom Filter and R.P. Fedder. APC Filtration Inc., is an ISO 9001.2015 quality managed manufacturer providing over 40 years of custom and critical air filter design, engineering, manufacturing and air filter testing for global OEM's of industrial and commercial equipment.