26" x 34" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Fixed Blades actual front end outer dimensions

actual front end outer dimensions are approximately 26 5/8" width X 10 5/8" height

75"H – fits a 20" X 18" duct opening

actual front end outer dimensions are approximately 22 5/8" width X 16 5/8" height

+ Product Details Perfect Fit & Easy Sizing - Designed for a 8" x 26" or 26" x 8" duct opening (measured at the opening)

+ Product Details Perfect Fit & Easy Sizing - Designed for a 18" x 30" OR 30" x 18" duct opening (measured at the opening)

26" x 34" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Fixed Blades actual front end outer dimensions+ Product Details Perfect Fit & Easy Sizing Designed for a 26" x 34" OR 34" x 26" duct opening (measured at the opening), with actual outer dimensions of 28. 5" W x 36. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 25. 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