24" X 8" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 26 5/8" X 10 5/8"] w30h30 + Product Details Size – 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size – 20"w X 6"h is the size for the duct opening measurement only

+ Product Details Size – 18" Corner Baseboard Grille - White - HVAC corner vent cover

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actual front end outer dimensions are approximately 22 5/8" width X 42 5/8" height

All of these grills have dampers

24" X 8" Steel Return Air Filter Grille for 1" Filter Removable Frame [Outer Dimensions: 26 5 8" X 10 5 8"] w30h30 + Product Details Size – 4 X 12 Is CRFG2028 Width_14in + Product Details Size – 20"w X 6"h is the size for the duct opening measurement only + Product Details Size – 18" Corner Baseboard Grille White HVAC corner vent cover