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

+ Product Details Size – 8" x 16" or 16" x 8" is the size for the duct opening measurement only

Optional Butterfly Damper Available At Asin: B007CNEL1W

+ Product Details Size – 20"w X 8"h is the size for the duct opening measurement only

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

+ Product Details Size - 25"w X 26"h is the size for the duct opening measurement only

22" x 24" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 10in diameter + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 22" x 24" OR 24" x 22" duct opening (measured at the opening), with actual outer dimensions of 24. 5" W x 26. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 21. 75" x 25. 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