34" x 30" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 10in diameter + Product Details Size –

+ Product Details Size – 34"w X 18"h is the size for the duct opening measurement only

+ Product Details Size – 25"w X 24"h is the size for the duct opening measurement only

+ Product Details Size – 6" x 24" or 24" x 6" is the size for the duct opening measurement only

actual front end outer dimensions are approximately 22 5/8" width X 42 5/8" height -

34" x 30" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 10in diameter + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 34" x 30" Or 30" x 34" duct opening (measured at the opening), with actual outer dimensions of 36. 5" W x 30. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 33. 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