Many ask us if Rossi Hardware can be used with rectangular dampers. Yes, Rossi regulators, bushings and bars are compatible with any size rectangular blades. The combination we recommend for the duct shop interested in building rectangular dampers is (1) Megalock regulator (for 1/2 inch round or square shaft) (2) 1/2 inch snap-in bushings (3)1/2 inch inch u-channels to affix your rectangular blade to the square shaft. Please note that we don’t provide rectangular blades themselves as they are far too varied in sizes to be standardized.
Megalock regulator (1/2 inch shaft – round or square)
Snap-In bushings (1/2 inch)
U-channels (1/2 inch)