AIR DUCT REGISTER WITH IMPROVED AIR FLOW

A register for mounting on an opening of an air duct in a structure includes an annular face plate with a perimeter side wall sized and configured for a close fit with the opening. Two plenums are positioned inside the perimeter side wall, with a recess surrounding the plenums. Each plenum has a planar top surface that is adjacent or nearly co-planar with the annular face plate. The plenums open to the air duct and define a plurality of cavities beneath the top surface. A plurality of vent openings are defined in a perimeter wall of each plenum so that air from the air duct enters the plurality of cavities and flows through the plurality of vent openings and through the recess into the surrounding environment. The register presents a generally uniform aesthetic appearance between the face plate and the top surfaces of the plenums. The configuration of the cavities and vent openings creates turbulent air flow, thereby increasing the air flow through the register relative to louvered registers having the same flow area.