20" x 16" Return Air Grille - Sidewall and Ceiling - HVAC Vent Duct Cover Diffuser - White [Outer Dimensions: 21.75w X 17.75"h] - Heating Vents - Amazon.com
SCF1616 16x16 Inch Air Return Filter Grille
Save $$ by Air Sealing the Return Air Grille | Cold Air Return
Everbilt 30 in. x 6 in. Steel Return Air Grille with 1/3 in. Fin Spacing in White E17330X06 - The Home Depot
Paintable Wood Air Return Grille - 25" x 20" Duct Size
30" x 10" Return Air Grille - Sidewall and Ceiling - HVAC Vent Duct Cover Diffuser - White [Outer Dimensions: 31.75w X 11.75"h] - Amazon.com
Decorative Resin Air Return Filter Grille
20 x 25 Wood Return Air Filter Grille - Complete Home Hardware
14"w X 6"h Steel Return Air Grilles - Sidewall and Ceiling - HVAC Duct Cover - White [Outer Dimensions: 15.75"w X 7.75"h] - Heating Vents - Amazon.com
Rocky Mountain Goods Air Return Grille - Heavy Duty Steel with Premium Finish - Includes Full Installation kit - Louvered Design - Paintable Vent Cover - Matte White - Consistent air Flow (10" x 6") - Amazon.com
18x6" Linear Bar Grille / Supply & Return Air Grille with Removable Co – Linear Air Diffusers
Truaire 25x20 170 Stamped Face Return Air Grille
30" x 8" Invisagrille Flush Removable Cold Air Return Cover