Patent ID: 7232369

Claim:
A system for modulating the flow of air to be supplied to a space, the system comprising: a plenum for supplying pressurized air to the space; a ventilation module having an upper area and a lower area, the ventilation module being in communication with the plenum for receiving the pressurized air from the plenum and conveying the pressurized air to the space; a grille having at least one diffusing rib extending longitudinally along the grille, the grill being located proximate the upper area of the module for diffusing the pressurized air exiting the ventilation module into the space; a first apertured plate located below the grille, the first apertured plate having a plurality of holes defining a gross aperture area exposed to the plenum for providing a flow of air; and wherein a hole of the plurality of holes has an aspect ratio different than one such that it has a longitudinal extent aligned substantially transverse to the longitudinal extent of the diffusing rib of the grille.