18" X 18" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - Ceiling Recommended - HVAC Duct Cover - Flat" Stamped Face - White [Outer Dimensions: 20.5 X 19.75] 18 X 18
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18" X 18" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - Ceiling Recommended - HVAC Duct Cover - Flat" Stamped Face - White [Outer Dimensions: 20.5 X 19.75] 18 X 18