24" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 10in diameter + Product Details Size –

+ Product Details Size – 12"w X 22"h is the size for the duct opening measurement only

+ Product Details Size - 14"w X 12"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 14" x 36" OR 36" X 14" duct opening (measured at the opening)

actual front end outer dimensions are approximately 20 5/8" width X 24 5/8" height

24" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 10in diameter + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 24" x 8" OR 8" x 24" duct opening (measured at the opening), with actual outer dimensions of 26. 5" W x 10. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 23. 75" x 7. 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