24" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Powder Coated + Product Details Size –

+ Product Details Size – 18"w X 22"h is the size for the duct opening measurement only

+ Product Details Size – 12"w X 4"h is the size for the duct opening measurement only

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

Rigid Built For External Use– The sturdy and rigid design features noise free components that eliminates vibration and excess noise to the louvers

24" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Powder Coated + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 24" x 12" OR 12" x 24" duct opening (measured at the opening), with actual outer dimensions of 26. 5" W x 14. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 23. 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