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Return Air Grille for and 18" x 18" opening. 21" x 21" overall size. Square design. Black finish. - Majestic Vent Covers
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30"w X 6"h Steel Return Air Grilles - Sidewall and Ceiling - HVAC Duct Cover - White [Outer Dimensions: 31.75"w X 7.75"h] - Heating Vents - Amazon.com
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