30" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 18" Round Duct Pipe actual front end outer dimensions

actual front end outer dimensions are approximately 38 5/8" width X 14 5/8" height -

actual front end outer dimensions are approximately 34 5/8" width X 34 5/8" height

Design – Heavy gauge steel

+ Product Details Size – 28"w X 18"h is the size for the duct opening measurement only

30" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 18" Round Duct Pipe actual front end outer dimensions+ 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