30" x 34" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w28h28 + Product Details Size –

+ Product Details Size – 28"w X 32"h is the size for the duct opening measurement only

+ Product Details Size – 22"w X 16"h is the size for the duct opening measurement only

Assembeled Before Powder Coat Paint

75"H – fits a 20" X 10" duct opening

+ Product Details Perfect Fit & Easy Sizing - Designed for a 12" x 20" or 20" x 12" duct opening (measured at the opening)

30" x 34" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w28h28 + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 30" x 34" OR 34" x 30" duct opening (measured at the opening), with actual outer dimensions of 32. 5" W x 36. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 29. 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