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24" X 24 Steel Return Air Filter Grille for 1" Filter - Easy Plastic Tabs for Removable Face/Door - HVAC Duct Cover - Flat Stamped Face - White [Outer Dimensions: 25.75 X 25.75] - Heating Vents - Amazon.com
Return Air Grille for and 18" x 18" opening. 21" x 21" overall size. Square design. Black finish. - Majestic Vent Covers
PRICE Lay-In Mount Return Air Grille: 22 in Max. Duct Ht (In.), 22 in Max. Duct Wd (In.), White - 46V226|530 - Grainger
GRAINGER APPROVED Filtered Return Air Grille: 25 in Max. Duct Ht (In.), 16 in Max. Duct Wd (In.) - 4MJT5|4MJT5 - Grainger
PRICE Security Return Air Grille: 10 in Max. Duct Ht (In.), 6 in Max. Duct Wd (In.), White, Steel - 46V187|MSPG-GR000005 - Grainger
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26"w X 12"h Steel Return Air Grilles - Sidewall and Ceiling - HVAC Duct Cover - White [Outer Dimensions: 27.75"w X 13.75"h] - - Amazon.com
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