Undulated surface enhancement of diffuser blade for plenum slot diffuser

A plenum slot diffuser blade configured to receive an air flow and to distribute the air flow toward a space to condition the space, comprising:

• a leading edge configured to face the air flow and extending along a length of the plenum slot diffuser blade;
• a width extending transverse to the length, wherein the width comprises a curved profile extending along a majority of the width;
• an undulated contour formed by peaks and valleys extending along the leading edge and into and out of the width, wherein the peaks and the valleys are joined such that the undulated contour forms a continuously smooth, wave-like curvature across the peaks and the valleys without a straight segment, without a sharp segment, without a jagged segment, and without a saw-like segment;
• and
• a wave shape extending along the length of the plenum slot diffuser blade at a position along the width of the plenum slot diffuser blade between the leading edge and a trailing edge of the plenum slot diffuser blade, wherein the wave shape and the undulated contour comprise corresponding curvatures into and out of the width of the plenum slot diffuser blade.