24" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w26h26 diagonally feed it through the

diagonally feed it through the square hole

+ Product Details Size – 26"w X 14"h is the size for the duct opening measurement only

+ Product Details Size – 14" x 16" or 16" x 14" is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 26" x 18" OR 18" x 26" duct opening (measured at the opening)

actual front end outer dimensions are approximately 38 5/8" width X 8 5/8" height

24" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w26h26 diagonally feed it through the+ Product Details Perfect Fit & Easy Sizing Designed for a 24" x 6" OR 6" x 24" duct opening (measured at the opening), with actual outer dimensions of 26. 5" W x 8. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 23. 75" x 5. 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 Made