12" x 30" or 30" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Fixed Blades with Damper Actual Filter Size – 25

Actual Filter Size – 25 3/4"w x 31 3/4" x 1"

the actual front end outer dimensions are 7" in diameter

+ Product Details Size – 34"w X 26"h is the size for the duct opening measurement only

10"w X 2"h Is The Size For The Duct Opening Measurement Only

12" x 30" or 30" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Fixed Blades with Damper Actual Filter Size – 25+ Product Details Perfect Fit & Easy Sizing Designed for a 12" x 30" or 30" x 12" duct opening (measured at the opening), with actual outer dimensions of 14. 5" W x 32. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 11. 75" x 29. 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