34" x 28" Cube Core Eggcrate Return Air Filter Grille for 1" Filter return grille + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 14" x 8" or 8" x 14" duct opening (measured at the opening)

+ Product Details Size – 26" x 36" or 36" x 26" is the size for the duct opening measurement only

Actual Filter Size – 19 3/4"w x 25 3/4" x 1"

+ Product Details Size – 10"w X 16"h is the size for the duct opening measurement only

34" x 28" Cube Core Eggcrate Return Air Filter Grille for 1" Filter return grille + Product Details Perfect Fit+ Product Details Perfect Fit & Easy Sizing Designed for a 34" x 28" Or 28" x 34" duct opening (measured at the opening), with actual outer dimensions of 36. 5" W x 30. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 33. 75" x 27. 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