34" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w8h8 display === '') { dd

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+ Product Details Perfect Fit & Easy Sizing - Designed for a 12" x 12" duct opening (measured at the opening)

+ Product Details Size – 14"w X 2"h is the size for the duct opening measurement only

10" x 4" Floor Register HVAC Air Supply Grille - Heavy Duty Rigid Built - Plastic Never Rust Vent Duct Cover

Ideal for Walls & Ceilings: Designed for seamless installation in standard 10" X 6" duct openings

34" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w8h8 display === '') { dd+ Product Details Perfect Fit & Easy Sizing Designed for a 34" x 10" Or 10" x 34" duct opening (measured at the opening), with actual outer dimensions of 36. 5" W x 12. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 33. 75" x 9. 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