28" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Fixed Blades + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 36" x 16" OR 16" x 36" duct opening (measured at the opening)

actual front end outer dimensions are approximately 28 5/8" width X 14 5/8" height

+ Why HVAC Premium

+ Product Details Perfect Fit & Easy Sizing - Designed for a 24" x 10" OR 10" x 24" duct opening (measured at the opening)

28" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Fixed Blades + Product Details Perfect Fit+ Product Details Perfect Fit & Easy Sizing Designed for a 28" x 6" OR 6" x 28" duct opening (measured at the opening), with actual outer dimensions of 30. 5" W x 8. 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 Made