The VPQ architectural VAV ceiling diffuser provides the building designer with the desired appearance and superior performance of a uniform 360° radial horizontal discharge air pattern that delivers even air throughout the space. The 24”x24” VPQ has a square faceplate made of one-piece, non-folded material with rounded corners, giving the diffuser a clean appearance that is unobtrusive to ceiling systems. The single faceplate gives the diffuser reduced pressure drops, a quiet sound profile, and is held in place by hooks that lock into the backpan. The one-piece, stamped backpan provides smooth, consistent corners, exacting dimensions, and performance tolerances.