28" x 22" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible with Duct 10" + Product Details Size –

+ Product Details Size – 22" x 30" or 30" x 22" is the size for the duct opening measurement only

+ Product Details Size – 22"w X 24"h is the size for the duct opening measurement only

+ Product Details Size - 34"w X 18"h is the size for the duct opening measurement only

+ Product Details Size - 26"w X 14"h is the size for the duct opening measurement only

28" x 22" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible with Duct 10" + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 28" x 22" OR 22" x 28" duct opening (measured at the opening), with actual outer dimensions of 30. 5" W x 24. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 27. 75" x 21. 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