16" X 28" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 18 5/8" X 30 5/8"] w34h34 + Product Details Size - 14" Round Duct Pipe For 10 duct opening FR M 414 White

+ Product Details Size - 28"w X 24"h is the size for the duct opening measurement only

Design – Removable frame for easy filter change & cleaning - uses a 1" thick filter

actual front end outer dimensions are approximately 16 5/8" width X 22 5/8" height

+ Product Details Size – 25"w X 10"h is the size for the duct opening measurement only

16" X 28" Steel Return Air Filter Grille for 1" Filter Removable Frame [Outer Dimensions: 18 5 8" X 30 5 8"] w34h34 + Product Details Size 14" Round Duct Pipe For 10 duct opening FR M 414 White + Product Details Size 28"w X 24"h is the size for the duct opening measurement only Design – Removable frame for easy filter change & cleaning uses a 1" thick filter