PRICE, Steel, Lay-In Mount Return Air Grille, Lay-In Mount Return Air Grille - 46V226|530 - Grainger
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12"w X 6"h Steel Return Air Grilles - Sidewall and Ceiling - HVAC Duct Cover - White [Outer Dimensions: 13.75"w X 7.75"h] - Heating Vents - Amazon.com
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30" x 8" HVAC Return Air Grille - Plastic Never Rust Vent Duct Cover - for Wall & Ceiling [Outer Dimensions: 32w X 10"h] - - Amazon.com
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