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

+ Product Details Size - 18"w X 16"h is the size for the duct opening measurement only

this 4-way air vent diffuser allows you to precisely control airflow

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actual front end outer dimensions are approximately 30 5/8" width X 22 5/8" height

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