GRAINGER APPROVED Filtered Return Air Grille: 25 in Max. Duct Ht (In.), 16 in Max. Duct Wd (In.) - 4MJT5|4MJT5 - Grainger
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43519 - Hart & Cooley 43519 - 20" x 20" (Wall Opening Size) White Sidewall/Ceiling Return Air Filter Grille (673 Series)
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20"w X 10"h Steel Return Air Grilles - Sidewall and Ceiling - HVAC Duct Cover - White [Outer Dimensions: 21.75"w X 11.75"h] - - Amazon.com
PRICE Lay-In Mount Return Air Grille: 22 in Max. Duct Ht (In.), 22 in Max. Duct Wd (In.), White - 46V226|530 - Grainger
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16"w X 8"h Steel Return Air Grilles - Sidewall and Ceiling - HVAC Duct Cover - White [Outer Dimensions: 17.75"w X 9.75"h] - Heating Vents - Amazon.com
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