18" x 22" or 22" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter with filter + Product Details Size –

+ Product Details Size – 30"w X 22"h is the size for the duct opening measurement only

+ Product Details Size – 6" x 28" or 28" x 6" is the size for the duct opening measurement only

actual front end outer dimensions are approximately 34 5/8" width X 34 5/8" height

actual front end outer dimensions are approximately 16 5/8" width X 27 5/8" height

18" x 22" or 22" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter with filter + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 18" x 22" OR 22" x 18" duct opening (measured at the opening), with actual outer dimensions of 20. 5" W x 24. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 17. 75" x 21. 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