20" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Insulated Line please note that the total

please note that the total outer dimensions of the grille measure 6" in diameter

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

commercial

+ Product Details Perfect Fit & Easy Sizing - Designed for a 12" x 22" or 22" x 12" duct opening (measured at the opening)

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

20" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Insulated Line please note that the total+ Product Details Perfect Fit & Easy Sizing Designed for a 20" x 12" OR 12" x 20" duct opening (measured at the opening), with actual outer dimensions of 22. 5" W x 14. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 19. 75" x 11. 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