10" x 32" or 32" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 12.5" X 34.5"] w18h18 + Product Details Size –

+ Product Details Size – 18"w X 32"h is the size for the duct opening measurement only

+ Product Details Size – 18" x 36" or 36" x 18" is the size for the duct opening measurement only

75" width X 11

+ Product Details Size - 34"w X 30"h is the size for the duct opening measurement only

expanding or retracting the gap to meet your precise needs

10" x 32" or 32" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 12.5" X 34.5"] w18h18 + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 10" x 32" or 32" x 10" duct opening (measured at the opening), with actual outer dimensions of 12. 5" W x 34. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 9. 75" x 31. 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