12" x 26" or 26" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_Red Oak Actual Filter Size – 33 Product Details Size 14 RG1612AL Height_16in

Actual Filter Size – 33 3/4"w x 5 3/4" x 1"

+ Product Details Size - 28"w X 36"h is the size for the duct opening measurement only

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

Easy Unrestricted Air Flow For Your HVAC System

actual front end outer dimensions are approximately 32 5/8" width X 24 5/8" height -

12" x 26" or 26" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_Red Oak Actual Filter Size – 33 Product Details Size 14 RG1612AL Height_16in Actual Filter Size – 33 3 4"w x 5 3 4" x 1" + Product Details Size 28"w X 36"h is the size for the duct opening measurement only