12" x 34" or 34" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Powder-Coated + Product Details Size –

+ Product Details Size – 18" x 20" or 20" x 18" is the size for the duct opening measurement only

+ Product Details Size – 24"w X 14"h is the size for the duct opening measurement only

+ Product Description When it's time to upgrade your HVAC Vents in your house

Its elegant look and fine finish and the natural warmth of oak wood

Actual Filter Size – 21 3/4"w x 15 3/4" x 1"

12" x 34" or 34" 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 12" x 34" or 34" x 12" duct opening (measured at the opening), with actual outer dimensions of 14. 5" W x 36. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 11. 75" x 33. 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