26" x 24" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible With Duct 6in actual front end outer dimensions

actual front end outer dimensions are approximately 34 5/8" width X 27 5/8" height -

diagonally feed it through the square hole

+ Product Details Perfect Fit & Easy Sizing - Designed for a 22" x 36" OR 36" x 22" duct opening (measured at the opening)

+ Product Details Perfect Fit & Easy Sizing - Designed for a 12" x 30" or 30" x 12" duct opening (measured at the opening)

Removable core for access to optional damper

26" x 24" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible With Duct 6in actual front end outer dimensions+ Product Details Perfect Fit & Easy Sizing Designed for a 26" x 24" OR 24" x 26" duct opening (measured at the opening), with actual outer dimensions of 28. 5" W x 26. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 25. 75" x 23. 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