36" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter flat stamped steel + Product Details Size –

+ Product Details Size – 22"w X 8"h is the size for the duct opening measurement only

making it adaptable to various airflow needs

actual front end outer dimensions are approximately 23

actual front end outer dimensions are approximately 32 5/8" width X 16 5/8" height

+ Product Details Size - 24"w X 2"h is the size for the duct opening measurement only

36" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter flat stamped steel + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 36" x 20" OR 20" x 36" duct opening (measured at the opening), with actual outer dimensions of 38. 5" W x 22. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 35. 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