36" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w10h10 + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 6" x 12" or 12" x 6" duct opening (measured at the opening)

+ Product Details Size – 20"w X 25"h is the size for the duct opening measurement only

our Round Air Vent Supply Grille is the perfect addition

Actual Filter Size – 7 3/4"w x 13 3/4" x 1"

36" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w10h10 + Product Details Perfect Fit+ Product Details Perfect Fit & Easy Sizing Designed for a 36" x 14" OR 14" x 36" duct opening (measured at the opening), with actual outer dimensions of 38. 5" W x 16. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 35. 75" x 13. 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