24" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Fixed Blades with Damper our damper is designed to

our damper is designed to perfectly align with your setup

ensuring consistent and efficient air distribution throughout your space

Multi-shutter damper with easy lever for precise airflow control

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

24" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Fixed Blades with Damper our damper is designed to+ Product Details Perfect Fit & Easy Sizing Designed for a 24" x 18" OR 18" x 24" duct opening (measured at the opening), with actual outer dimensions of 26. 5" W x 20. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 23. 75" x 17. 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