24" x 30" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 6in diameter The grille comes with all

The grille comes with all necessary screws for a secure fit

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

Filter Size - 21

+ Product Details Perfect Fit & Easy Sizing - Designed for a 18" x 28" OR 28" x 18" duct opening (measured at the opening)

+ Product Details Size - 25"w X 26"h is the size for the duct opening measurement only

24" x 30" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 6in diameter The grille comes with all+ Product Details Perfect Fit & Easy Sizing Designed for a 24" x 30" OR 30" x 24" duct opening (measured at the opening), with actual outer dimensions of 26. 5" W x 32. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 23. 75" x 29. 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