32" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_R-4.2 Yellow 875" width X 11

875" width X 11

+ Product Details Size – 20" x 28" or 28" x 20" is the size for the duct opening measurement only

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

+ Product Details Size - 20"w X 14"h is the size for the duct opening measurement only

Filter Size - 9

32" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_R-4.2 Yellow 875" width X 11+ Product Details Perfect Fit & Easy Sizing Designed for a 32" x 8" OR 8" x 32" duct opening (measured at the opening), with actual outer dimensions of 34. 5" W x 10. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 31. 75" x 9. 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