24" x 34" 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 14" x 28" OR 28" X 14" duct opening (measured at the opening)

When you're ready for a decor upgrade

+ Product Details Size - 4"w X 12"h is the size for the duct opening measurement only

Actual Filter Size – 24 3/4"w x 17 3/4" x 1"

actual front end outer dimensions are 26

24" x 34" 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 24" x 34" OR 34" x 24" duct opening (measured at the opening), with actual outer dimensions of 26. 5" W x 36. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 23. 75" x 33. 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