28" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter RV Mobile Home + Product Details Size –

+ Product Details Size – 22" x 24" or 24" x 22" is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 30" x 12" OR 12" x 30" duct opening (measured at the opening)

+ Product Details Size – 12" x 14" or 14" x 12" is the size for the duct opening measurement only

provides a modern look and quiet operation due to its half-inch by half-inch cube design

28" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter RV Mobile Home + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 28" x 8" OR 8" x 28" duct opening (measured at the opening), with actual outer dimensions of 30. 5" W x 10. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 27. 75" x 5. 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