24" x 26" Cube Core Eggcrate Return Air Filter Grille for 1" Filter return filter actual front end outer dimensions

actual front end outer dimensions are approximately 22 5/8" width X 42 5/8" height -

Ideal for Walls & Ceilings: Designed for seamless installation in standard 8" X 4" duct openings

reducing energy costs and maximizing HVAC system lifespan

+ Product Details Size – 4"w X 10"h is the size for the duct opening measurement only

Rigid gauge built for durability and long life in mind

24" x 26" Cube Core Eggcrate Return Air Filter Grille for 1" Filter return filter actual front end outer dimensions+ Product Details Perfect Fit & Easy Sizing Designed for a 24" x 26" OR 26" x 24" duct opening (measured at the opening), with actual outer dimensions of 26. 5" W x 28. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 23. 75" x 25. 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