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

+ Product Details Size – 30"w X 14"h is the size for the duct opening measurement only

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

our grill boasts an impressive 96% airflow capacity

Actual Filter Size – 29 3/4"w x 13 3/4" x 1"

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