20" x 22" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 10" Diameter + Product Details Size – 14" Round Duct Pipe For 10 duct opening FR M 414 White

+ Product Details Size – 30"w X 22"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 12" x 30" or 30" x 12" duct opening (measured at the opening)

Actual Filter Size – 13 3/4"w x 19 3/4" x 1"

this 4-way air vent diffuser allows you to precisely control airflow

20" x 22" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 10" Diameter + Product Details Size – 14" Round Duct Pipe For 10 duct opening FR M 414 White + Product Details Size – 30"w X 22"h is the size for the duct opening measurement only + Product Details Perfect Fit & Easy Sizing Designed for a 12" x 30" or 30" x 12" duct opening (measured at the opening)