26" x 32" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 10" Diameter + Product Details Size -

+ Product Details Size - 30"w X 30"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 16 5/8" width X 24 5/8" height

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

+ Product Details Size – 14"w X 30"h is the size for the duct opening measurement only

+ Product Details Size - The listed 10" diameter refers specifically to the size of the duct opening

26" x 32" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 10" Diameter + Product Details Size -+ Product Details Perfect Fit & Easy Sizing Designed for a 26" x 32" OR 32" x 26" duct opening (measured at the opening), with actual outer dimensions of 28. 5" W x 34. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 25. 75" x 31. 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