12" x 6" or 6" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 14.5" X 8.5"] w30h30 + Product Details Size –

+ Product Details Size – 36"w X 30"h is the size for the duct opening measurement only

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+ Product Details Perfect Fit & Easy Sizing - Designed for a 14" x 24" OR 24" X 14" duct opening (measured at the opening)

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12" x 6" or 6" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 14.5" X 8.5"] w30h30 + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 12" x 6" or 6" x 12" duct opening (measured at the opening), with actual outer dimensions of 14. 5" W x 8. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 11. 75" x 5. 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 Made