22" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w24h24 + Product Details Size –

+ Product Details Size – 36"w X 12"h is the size for the duct opening measurement only

+ Product Details Size - 25"w X 30"h is the size for the duct opening measurement only

+ Product Details Size - 8"w X 24"h X 2"d (for duct opening measurement only)

actual front end outer dimensions are approximately 20 5/8" width X 36 5/8" height

+ Product Details Perfect Fit & Easy Sizing - Designed for a 24" x 10" OR 10" x 24" duct opening (measured at the opening)

22" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w24h24 + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 22" x 12" OR 12" x 22" duct opening (measured at the opening), with actual outer dimensions of 24. 5" W x 14. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 21. 75" x 11. 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