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 actual front end outer dimensions Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

actual front end outer dimensions are approximately 9

Installs Directly On Round & Oval Spiral Duct - No Frames

+ Product Details Size – 48"w X 24"h is the size for the duct opening measurement only

+ Product Details Size - 28"w X 30"h is the size for the duct opening measurement only

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

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 actual front end outer dimensions Compatible With Duct 7in Applications This sheet metal DDAG A 1212 actual front end outer dimensions are approximately 9 Installs Directly On Round & Oval Spiral Duct No Frames