18" x 30" or 30" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 10" Round Duct Pipe Actual Filter Size – 29

Actual Filter Size – 29 3/4"w x 9 3/4" x 1"

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

Made from high-quality aluminum

Ideal for Walls & Ceilings: Designed for seamless installation in standard 18" X 6" duct openings

Multi-shutter damper with easy lever for precise airflow control

18" x 30" or 30" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 10" Round Duct Pipe Actual Filter Size – 29+ Product Details Perfect Fit & Easy Sizing Designed for a 18" x 30" OR 30" x 18" duct opening (measured at the opening), with actual outer dimensions of 20. 5" W x 32. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 17. 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