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"

+ Product Details Size – 25"w X 12"h is the size for the duct opening measurement only

Designed for optimal air flow and lasting durability

actual front end outer dimensions are approximately 14 5/8" width X 30 5/8" height

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