30" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Powder Coated + Product Details Size -

+ Product Details Size - 30"w X 30"h is the size for the duct opening measurement only

6" x 6" - opening (vent hole - Neck Size) dimension - actual size is approx 2" wider

+ Product Details Size – 6" x 12" or 12" x 6" is the size for the duct opening measurement only

+ Product Details Size - 28"w X 32"h is the size for the duct opening measurement only

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

30" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Powder Coated + Product Details Size -+ Product Details Perfect Fit & Easy Sizing Designed for a 30" x 10" OR 10" x 30" duct opening (measured at the opening), with actual outer dimensions of 32. 5" W x 12. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 29. 75" x 9. 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