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

+ Product Details Size – 16"w X 36"h is the size for the duct opening measurement only

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

Filter Size - 23

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Actual Filter Size – 35 3/4"w x 23 3/4" x 1"

12" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 14.5" X 14.5"] fixed bar + 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