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Custom Corinthian Vent Cover Return Air Filter Frame (Bronze) - 30" x 24.5" opening size (32.5" x 26.25" overall) no mounting holes, With filter frame - Vent and Cover
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18" X 18" Return Air Filter Grille - Filter Included - Easy Plastic Tabs for Removable Face/Door - HVAC VENT DUCT COVER - White [Outer Dimensions: 19.75w X 19.75h] - Amazon.com
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Venti Air 24 in Wide x 18 in High Return Air Filter Grille - Free 2-3 Business Day Delivery - Walmart.com
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24" X 20" Return Air Filter Grille - Filter Included - Easy Plastic Tabs for Removable Face/Door - HVAC Vent Duct Cover - White [Outer Dimensions: 25.75w X 21.75h] - Amazon.com
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Venti Air 12 in. x 12 in. Square Return Air Filter Grille of Steel in White HFG1212 - The Home Depot
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