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

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

875" width X 9

Smooth powder-coated white finish for a sleek look and scratch resistance

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

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 Perfect Fit+ 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