28" x 26" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Black Actual Filter Size – 33

Actual Filter Size – 33 3/4"w x 7 3/4" x 1"

actual front end outer dimensions are approximately 12 5/8" width X 26 5/8" height

Actual Filter Size – 11 3/4"w x 23 3/4" x 1"

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

28" x 26" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Black Actual Filter Size – 33+ Product Details Perfect Fit & Easy Sizing Designed for a 28" x 26" OR 26" x 28" duct opening (measured at the opening), with actual outer dimensions of 30. 5" W x 28. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 27. 75" x 25. 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