24" X 12" Steel Return Air Filter Grille for 1" Filter - Removable Frame - * Filter Included * [Outer Dimensions: 26 5/8" X 14 5/8"] 6" Round Duct Pipe 4" X 14" Is The 4 X 12 Is CRFG2028 Width_14in

4" X 14" Is The Size For The Duct Opening (floor/vent hole) Measurement Only

Actual Filter Size – 17 3/4"w x 7 3/4" x 1"

including the ability to mount without removing the thermostat when using the ring base

+ Product Details Size - 32"w X 20"h is the size for the duct opening measurement only

The grille comes with all necessary screws for a secure fit

24" X 12" Steel Return Air Filter Grille for 1" Filter Removable Frame * Filter Included * [Outer Dimensions: 26 5 8" X 14 5 8"] 6" Round Duct Pipe 4" X 14" Is The 4 X 12 Is CRFG2028 Width_14in 4" X 14" Is The Size For The Duct Opening (floor vent hole) Measurement Only Actual Filter Size – 17 3 4"w x 7 3 4" x 1"