26" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Adjustable Return + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 16" x 18" OR 18" X 16" duct opening (measured at the opening)

actual front end outer dimensions are approximately 20 5/8" width X 32 5/8" height -

+ Product Details Perfect Fit & Easy Sizing - Designed for a 14" x 26" OR 26" X 14" duct opening (measured at the opening)

75"H – fits a 20" X 10" duct opening

actual front end outer dimensions are approximately 34 5/8" width X 18 5/8" height

26" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Adjustable Return + Product Details Perfect Fit+ Product Details Perfect Fit & Easy Sizing Designed for a 26" x 18" OR 18" x 26" duct opening (measured at the opening), with actual outer dimensions of 28. 5" W x 20. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 25. 75" x 17. 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