26" x 24" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Filter Grille + Product Details Size -

+ Product Details Size - 4"w X 32"h is the size for the duct opening measurement only

+ Product Details Size - 36"w X 30"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 14 5/8" width X 32 5/8" height -

Experience enhanced indoor comfort with our 6" Butterfly Damper

26" x 24" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Filter Grille + Product Details Size -+ 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