24" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 8" Round Duct Pipe + Product Details Size –

+ Product Details Size – 24" x 28" or 28" x 24" is the size for the duct opening measurement only

+ Product Details Size – 25"w X 14"h is the size for the duct opening measurement only

+ Product Details Size – 6" x 32" or 32" x 6" is the size for the duct opening measurement only

actual front end outer dimensions are approximately 36 5/8" width X 26 5/8" height

24" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 8" Round Duct Pipe + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 24" x 20" OR 20" x 24" duct opening (measured at the opening), with actual outer dimensions of 26. 5" W x 22. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 23. 75" x 19. 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