28" x 34" Cube Core Eggcrate Return Air Filter Grille for 1" Filter return filter + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 14" x 10" or 10" x 14" duct opening (measured at the opening)

+ Product Details Perfect Fit & Easy Sizing - Designed for a 34" x 36" OR 36" x 34" duct opening (measured at the opening)

actual front end outer dimensions are approximately 19

actual front end outer dimensions are approximately 20 5/8" width X 28 5/8" height

+ Product Details Size – 14" x 28" or 28" x 14" is the size for the duct opening measurement only

28" x 34" Cube Core Eggcrate Return Air Filter Grille for 1" Filter return filter + Product Details Perfect Fit+ Product Details Perfect Fit & Easy Sizing Designed for a 28" x 34" OR 34" x 28" duct opening (measured at the opening), with actual outer dimensions of 30. 5" W x 36. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 27. 75" x 33. 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