20" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_Black actual front end outer dimensions

actual front end outer dimensions are approximately 34 5/8" width X 32 5/8" height

Actual Filter Size – 13 3/4"w x 31 3/4" x 1"

with actual outer dimensions of 30

+ Product Details Size – 20"w X 40"h is the size for the duct opening measurement only

Actual Front End Outer Dimensions Are 8" Diameter

20" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_Black actual front end outer dimensions+ Product Details Perfect Fit & Easy Sizing Designed for a 20" x 6" OR 6" x 20" duct opening (measured at the opening), with actual outer dimensions of 22. 5" W x 8. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 19. 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