16" x 28" or 28" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Copper Coil-Insulated Line Set the actual front end outer

the actual front end outer dimensions are 7" in diameter

10"w X 4"h Is The Size For The Duct Opening Measurement Only

Actual Filter Size – 17 3/4"w x 5 3/4" x 1"

display: block

+ Product Details Perfect Fit & Easy Sizing - Designed for a 18" x 22" OR 22" x 18" duct opening (measured at the opening)

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