IFI Butterfly dampers are available for a wide variety of applications in round ductwork, where low-leakage isolation, flow control, or a combination of the two is desired. Varying degrees of isolation can be obtained from 90 to 99.9% depending on the seal arrangement. Heavy-duty design that is suitable for applications with clean, corrosive, dirty, andor dry environments. Manufactured in-house under strict quality control procedures. IFI̢۪s range of butterfly dampers are best suited in Duct and Ventilation system where flow control and balancing is required.