28" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter return filter + Product Details Size -

+ Product Details Size - 22"w X 8"h is the size for the duct opening measurement only

actual front end outer dimensions are 19" Width X 11" Height

Actual Filter Size – 25 3/4"w x 27 3/4" x 1"

+ Product Description Introducing the 6" Butterfly Damper – Your Solution for Controlled Airflow

28" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter return filter + Product Details Size -+ Product Details Perfect Fit & Easy Sizing Designed for a 28" x 18" OR 18" x 28" duct opening (measured at the opening), with actual outer dimensions of 30. 5" W x 20. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 27. 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