20" x 28" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w16h16 + Product Details Size -

+ Product Details Size - 18"w X 18"h X 2"d (for duct opening measurement only)

Actual Front End Outer Dimensions Are 12" Width X 6" Height - SEE IN DESCRIPTION HOW TO MEASURE A GRILLE

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

75"H – fits a 24" X 4" duct opening

The total outer size of this grille is the listed size plus 2 and 5/85"

20" x 28" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w16h16 + Product Details Size -+ Product Details Perfect Fit & Easy Sizing Designed for a 20" x 28" OR 28" x 20" duct opening (measured at the opening), with actual outer dimensions of 22. 5" W x 30. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 19. 75" x 27. 75" x 1" Premium Airflow Efficiency High performance cube core eggcrate design allows 95% airflow efficiency, reducing energy costs and maximizing HVAC system lifespan. Durable, Rust Free Aluminum