Mader Butterfly dampers are available in round, square, and rectangular configurations. The A–100 series of dampers are engineered to meet each customer’s specified operating conditions, to assure dependable and trouble free operation. Mader manufactures round dampers from 3″ diameter to 216″ diameter. Square and rectangular dampers are offered in small and large sizes as well; limited only by good engineering practices.
A ball bearing unit can be added to the damper with the use of a mounting bracket (typical for both sides). These units are equipped with grease fittings for routine lubrication. Temperature range is 10˚F to 250˚F with intermittent service to 350˚F. For self-lubricating and high temperature applications a solid-lube carbon insert bearing is utilized.