18" x 22" or 22" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter with filter actual front end outer dimensions

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

75" width X 26

+ Product Details Perfect Fit & Easy Sizing - Designed for a 24" x 30" OR 30" x 24" duct opening (measured at the opening)

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

18" x 22" or 22" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter with filter actual front end outer dimensions+ 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