6" x 12" or 6" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 8.5" X 14.5"] Adjustable Return + Product Details Size –

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

For added versatility

Great emphasis has been invested in the design of this product to prevent it from kinking in sharp bends & turns and to hold steady and at full diameter in all applications

+ Product Details Size – 14"w X 4"h is the size for the duct opening measurement only

+ Product Details Size - 8"w X 26"h is the size for the duct opening measurement only

6" x 12" or 6" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 8.5" X 14.5"] Adjustable Return + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 6" x 12" or 12" x 6" duct opening (measured at the opening), with actual outer dimensions of 8. 5" W x 14. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 5. 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 Made