20" x 30" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w30h30 actual front end outer dimensions

actual front end outer dimensions are approximately 3

7/8" Insulated Copper Coil Line - Seamless Pipe Tube for HVAC

Filter Size - 20

With a 8" diameter for the duct opening measurement

20" x 30" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w30h30 actual front end outer dimensions+ Product Details Perfect Fit & Easy Sizing Designed for a 20" x 30" OR 30" x 20" duct opening (measured at the opening), with actual outer dimensions of 22. 5" W x 32. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 19. 75" x 29. 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