18" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 14" Diameter + Product Details Perfect Fit Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

+ Product Details Perfect Fit & Easy Sizing - Designed for a 34" x 20" Or 20" x 34" duct opening (measured at the opening)

providing a stylish and practical solution for ventilation

+ Product Details Size – 36"w X 20"h is the size for the duct opening measurement only

+ Product Details Size - 26"w X 10"h is the size for the duct opening measurement only

Actual Filter Size – 19 3/4"w x 15 3/4" x 1"

18" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 14" Diameter + Product Details Perfect Fit Compatible With Duct 7in Applications This sheet metal DDAG A 1212 + Product Details Perfect Fit & Easy Sizing Designed for a 34" x 20" Or 20" x 34" duct opening (measured at the opening) providing a stylish and practical solution for ventilation