18" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter flat stamped steel + Product Details Size -

+ Product Details Size - 32"w X 28"h is the size for the duct opening measurement only

Actual Filter Size – 35 3/4"w x 5 3/4" x 1"

The Contempo slotted Grate

+ Product Details Perfect Fit & Easy Sizing - Designed for a 24" x 32" OR 32" x 24" duct opening (measured at the opening)

18" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter flat stamped steel + Product Details Size -+ Product Details Perfect Fit & Easy Sizing Designed for a 18" x 10" OR 10" X 18" duct opening (measured at the opening), with actual outer dimensions of 20. 5" W x 10. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 17. 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