25" X 18" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 27 5/8" X 20 5/8"] Compatible With Duct 10in + Product Details Size – 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size – 10" X 2" is the size for the duct opening (floor/vent hole) measurement only

actual front end outer dimensions are approximately 26 5/8" width X 34 5/8" height

actual front end outer dimensions are approximately 32 5/8" width X 36 5/8" height

Looks Like It Was Just Waxed

Installs Directly On Round & Oval Spiral Duct - No Frames

25" X 18" Steel Return Air Filter Grille for 1" Filter Removable Frame [Outer Dimensions: 27 5 8" X 20 5 8"] Compatible With Duct 10in + Product Details Size – 4 X 12 Is CRFG2028 Width_14in + Product Details Size – 10" X 2" is the size for the duct opening (floor vent hole) measurement only actual front end outer dimensions are approximately 26 5 8" width X 34 5 8" height