16" x 32" or 32" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 18" Diameter only measure the "hole" in

only measure the "hole" in the wall/duct

All of these grills have dampers

Whether replacing an old register or installing a new vent

It comes with two versatile mounting base options—solid and ring—making installation simple and flexible

16" x 32" or 32" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 18" Diameter only measure the "hole" in+ Product Details Perfect Fit & Easy Sizing Designed for a 16" x 32" OR 32" X 16" duct opening (measured at the opening), with actual outer dimensions of 18. 5" W x 34. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 15. 75" x 31. 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