20" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Aluminum Bar actual front end outer dimensions

actual front end outer dimensions are approximately 18 5/8" width X 34 5/8" height

+ Product Description Improve your HVAC system with our high-quality

+ Product Details Size - 36"w X 6"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 10" x 18" or 18" x 10" duct opening (measured at the opening)

20" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Aluminum Bar actual front end outer dimensions+ Product Details Perfect Fit & Easy Sizing Designed for a 20" x 8" OR 8" x 20" duct opening (measured at the opening), with actual outer dimensions of 22. 5" W x 36. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 19. 75" x 7. 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