18" x 28" or 28" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Fixed Blades + Product Details Size -

+ Product Details Size - 28"w X 22"h is the size for the duct opening measurement only

ensuring even air distribution throughout your space

but still light and handy

reducing electric bills and extending HVAC machine lifespan

actual front end outer dimensions are approximately 30 5/8" width X 26 5/8" height

18" x 28" or 28" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Fixed Blades + Product Details Size -+ Product Details Perfect Fit & Easy Sizing Designed for a 18" x 28" OR 28" x 18" duct opening (measured at the opening), with actual outer dimensions of 20. 5" W x 30. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 17. 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