18" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible With Duct 10in The crank handle lever makes

The crank handle lever makes it easy to adjust to every weather situation

+ Product Details Size – 14" x 36" or 36" x 14" is the size for the duct opening measurement only

Actual Filter Size – 7 3/4"w x 35 3/4" x 1"

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18" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible With Duct 10in The crank handle lever makes+ Product Details Perfect Fit & Easy Sizing Designed for a 18" x 12" OR 12" X 18" duct opening (measured at the opening), with actual outer dimensions of 20. 5" W x 14. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 17. 75" x 11. 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