8"W X 4"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 9.25"W x 5.25"H] Curved Blade Steel + Product Details 16" x 4 X 12 Is CRFG2028 Width_14in

+ Product Details 16" x 25" x 1" replacement air filters for your furnace

Strong Sharp Cut – Straight Cuts - blade does not bend or break - uses SK5 Japanese alloy steel V blade for one point cut

+ Product Details Size - 14"w X 10"h is the size for the duct opening measurement only

standing dust

+ Product Details Size - 28"w X 28"h X 2"d (for duct opening measurement only)

8"W X 4"H [Duct Opening] Linear Aluminum Clip On Bar Return Air Grille [Outer Dimensions: 9.25"W x 5.25"H] Curved Blade Steel + Product Details 16" x 4 X 12 Is CRFG2028 Width_14in + Product Details 16" x 25" x 1" replacement air filters for your furnace Strong Sharp Cut – Straight Cuts blade does not bend or break uses SK5 Japanese alloy steel V blade for one point cut