24" x 28" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Powder-Coated actual front end outer dimensions

actual front end outer dimensions are approximately 18 5/8" width X 14 5/8" height -

Engineered with precision and designed to perfection

+ Product Details Size - 20"w X 34"h is the size for the duct opening measurement only

Its smooth

+ Product Details Size – 6" x 34" or 34" x 6" is the size for the duct opening measurement only

24" x 28" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Powder-Coated actual front end outer dimensions+ Product Details Perfect Fit & Easy Sizing Designed for a 24" x 28" OR 28" x 24" duct opening (measured at the opening), with actual outer dimensions of 26. 5" W x 30. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 23. 75" x 27. 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