18" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Grille actual front end outer dimensions

actual front end outer dimensions are approximately 10 5/8" width X 10 5/8" height

providing efficient performance of up to 300m3/h

Designed for both wall and ceiling applications

actual front end outer dimensions are approximately 32 5/8" width X 10 5/8" height -

18" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Grille actual front end outer dimensions+ Product Details Perfect Fit & Easy Sizing Designed for a 18" x 18" duct opening (measured at the opening), with actual outer dimensions of 20. 5" W x 20. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 20. 75" x 20. 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