20" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Insulated Line at predicted low air motion

at predicted low air motion 35 fpm in the zone of occupancy

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

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

+ Product Details Size – 8"w X 12"h is the size for the duct opening measurement only

20" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Insulated Line at predicted low air motion+ 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