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

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

Actual Filter Size – 11 3/4"w x 33 3/4" x 1"

rust-free aluminum construction with smooth finished edges and counter-sunk screw holes (screws included)

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

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