10" x 12" or 12" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 12.5" X 14.5"] Curved Blade Steel Actual Filter Size – 24

Actual Filter Size – 24 3/4"w x 19 3/4" x 1"

actual front end outer dimensions are approximately 12 5/8" width X 38 5/8" height

+ Product Details Size – 10"w X 34"h is the size for the duct opening measurement only

Filter Size - 13

This versatile diffuser is adaptable to various airflow needs

10" x 12" or 12" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 12.5" X 14.5"] Curved Blade Steel Actual Filter Size – 24+ Product Details Perfect Fit & Easy Sizing Designed for a 10" x 12" or 12" x 10" duct opening (measured at the opening), with actual outer dimensions of 12. 5" W x 14. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 9. 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