10" x 6" or 6" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 12.5" X 8.5"] white Actual Filter Size – 23

Actual Filter Size – 23 3/4"w x 15 3/4" x 1"

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Actual Filter Size – 13 3/4"w x 27 3/4" x 1"

+ Product Details Size – 20" x 28" or 28" x 20" is the size for the duct opening measurement only

actual front end outer dimensions are approximately 30 5/8" width X 38 5/8" height

10" x 6" or 6" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 12.5" X 8.5"] white Actual Filter Size – 23+ Product Details Perfect Fit & Easy Sizing Designed for a 10" x 6" or 6" x 10" duct opening (measured at the opening), with actual outer dimensions of 12. 5" W x 8. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 9. 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