10" x 36" or 36" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 12.5" X 38.5"] Compatible with Duct 10" Actual Filter Size – 11 Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

Actual Filter Size – 11 3/4"w x 27 3/4" x 1"

+ Product Details Size – 14" x 14" is the size for the duct opening measurement only

+ Product Description This aluminum flex duct is intended to be used in heating

+ Product Details Size – 29"w X 22"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 28" x 34" OR 34" x 28" duct opening (measured at the opening)

10" x 36" or 36" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Aluminum White [Outer Dimensions: 12.5" X 38.5"] Compatible with Duct 10" Actual Filter Size – 11 Compatible With Duct 7in Applications This sheet metal DDAG A 1212 Actual Filter Size – 11 3 4"w x 27 3 4" x 1" + Product Details Size – 14" x 14" is the size for the duct opening measurement only