12" X 10" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 14 5/8" X 12 5/8"] w18h18 + Product Details Size – 7" Round Duct Pipe CRG828 Product Details Size 14

+ Product Details Size – 24"w X 30"h is the size for the duct opening measurement only

Slots are angled to diversify the airflow in 2 way direction

+ Product Details Size – 12"w X 32"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 16 5/8" width X 38 5/8" height

Filter Size - 11

12" X 10" Steel Return Air Filter Grille for 1" Filter Removable Frame [Outer Dimensions: 14 5 8" X 12 5 8"] w18h18 + Product Details Size – 7" Round Duct Pipe CRG828 Product Details Size 14 + Product Details Size – 24"w X 30"h is the size for the duct opening measurement only Slots are angled to diversify the airflow in 2 way direction