34" x 30" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Material_Steel actual front end outer dimensions

actual front end outer dimensions are approximately 32 5/8" width X 18 5/8" height

Actual Filter Size – 23 3/4"w x 31 3/4" x 1"

+ Product Details Perfect Fit & Easy Sizing - Designed for a 20" x 6" OR 6" x 20" duct opening (measured at the opening)

+ Product Details Size - 24"w X 8"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 28 5/8" width X 10 5/8" height

34" x 30" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Material_Steel actual front end outer dimensions+ Product Details Perfect Fit & Easy Sizing Designed for a 34" x 30" Or 30" x 34" duct opening (measured at the opening), with actual outer dimensions of 36. 5" W x 30. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 33. 75" x 29. 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