18" x 32" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 10" Diameter Efficient Airflow Design: The slots

Efficient Airflow Design: The slots are meticulously angled to diversify airflow in two directions

+ Product Details Perfect Fit & Easy Sizing - Designed for a 12" x 34" or 34" x 12" duct opening (measured at the opening)

Choose from a palette of four elegant colors – white

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+ Product Details Size - 20"w X 36"h is the size for the duct opening measurement only

18" x 32" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 10" Diameter Efficient Airflow Design: The slots+ Product Details Perfect Fit & Easy Sizing Designed for a 18" x 32" OR 32" x 18" duct opening (measured at the opening), with actual outer dimensions of 20. 5" W x 34. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 17. 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