16" X 20" Steel Return Air Filter Grille for 1" Filter - Removable Frame - Black - [Outer Dimensions: 18 5/8" X 22 5/8"] Filter Grille + Product Details Size – Compatible with Duct 4" Product Details Size 32 LO246

+ Product Details Size – 12"w X 36"h is the size for the duct opening measurement only

+ Product Description Introducing our 18" Wooden Corner Baseboard Grille - a sophisticated addition to elevate your HVAC system and interior decor

Actual Filter Size – 7 3/4"w x 15 3/4" x 1"

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you can watch this informative video tutorial: How to Measure Your Vent Hole Before Ordering a Grille

16" X 20" Steel Return Air Filter Grille for 1" Filter Removable Frame Black [Outer Dimensions: 18 5 8" X 22 5 8"] Filter Grille + Product Details Size – Compatible with Duct 4" Product Details Size 32 LO246 + Product Details Size – 12"w X 36"h is the size for the duct opening measurement only + Product Description Introducing our 18" Wooden Corner Baseboard Grille a sophisticated addition to elevate your HVAC system and interior decor