10" x 34" or 34" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 12.5" X 36.5"] Fixed Blades + Product Details Size –

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

+ Product Details Size – 16" x 34" or 34" x 16" is the size for the duct opening measurement only

+ Product Details Size - 34"w X 14"h is the size for the duct opening measurement only

+ Product Details Size - 8"w X 6"h is the size for the duct opening measurement only

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10" x 34" or 34" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 12.5" X 36.5"] Fixed Blades + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 10" x 34" or 34" x 10" duct opening (measured at the opening), with actual outer dimensions of 12. 5" W x 36. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 9. 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