30" x 30" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Width_20in + Product Details Size –

+ Product Details Size – 24"w X 30"h is the size for the duct opening measurement only

Ideal for Walls & Ceilings: Designed for seamless installation in standard 10" X 8" duct openings

+ Product Details Size - 24"w X 4"h is the size for the duct opening measurement only

+ Product Details Size – 25"w X 24"h is the size for the duct opening measurement only

30" x 30" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Width_20in + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 30" x 30" duct opening (measured at the opening), with actual outer dimensions of 32. 5" W x 32. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 29. 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 Made from