30" X 16" Steel Return Air Filter Grille for 1" Filter - Removable Frame - Black - [Outer Dimensions: 32 5/8" X 18 5/8"] Return Grille + Product Details Perfect Fit 4" Round Duct Pipe Product Details Size The SHEASC10W1-HP

+ Product Details Perfect Fit & Easy Sizing - Designed for a 18" x 18" duct opening (measured at the opening)

[Outer Dimensions: 14

The first number in a grille size represents the width

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With our extensive selection of Grilles

30" X 16" Steel Return Air Filter Grille for 1" Filter Removable Frame Black [Outer Dimensions: 32 5 8" X 18 5 8"] Return Grille + Product Details Perfect Fit 4" Round Duct Pipe Product Details Size The SHEASC10W1 HP + Product Details Perfect Fit & Easy Sizing Designed for a 18" x 18" duct opening (measured at the opening) [Outer Dimensions: 14