28" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w8h8 + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 16" x 18" OR 18" X 16" duct opening (measured at the opening)

Never Rust Plastic 2-Way Vertical Air Supply Register

+ Product Details Perfect Fit & Easy Sizing - Designed for a 8" x 26" or 26" x 8" duct opening (measured at the opening)

designed for both sidewall and ceiling installations

listed size +2"

28" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w8h8 + Product Details Perfect Fit+ Product Details Perfect Fit & Easy Sizing Designed for a 28" x 16" OR 16" x 28" duct opening (measured at the opening), with actual outer dimensions of 30. 5" W x 18. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 27. 75" x 15. 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