10" x 16" or 16" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 12.5" X 18.5"] Aluminum Adjustable Curved Blade accordion-title:hover { background-color: #f0f0f0

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actual front end outer dimensions are approximately 18 5/8" width X 34 5/8" height

75" Width X 37

+ Product Details Size – 4"w X 8"h is the size for the duct opening measurement only

The process is intuitive: simply select the appropriate ceiling square for your grill

10" x 16" or 16" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 12.5" X 18.5"] Aluminum Adjustable Curved Blade accordion-title:hover { background-color: #f0f0f0+ Product Details Perfect Fit & Easy Sizing Designed for a 10" x 16" or 16" x 10" duct opening (measured at the opening), with actual outer dimensions of 12. 5" W x 18. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 9. 75" x 15. 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