30" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible with Duct 8" High Standard Quality - Every

High Standard Quality - Every part is hand inspected for quality before it is packaged

+ Product Description Introducing the 8" Radial Damper – Your Solution for Controlled Airflow

+ Product Details Size – 18"w X 36"h is the size for the duct opening measurement only

+ Product Details Size - 24"w X 26"h is the size for the duct opening measurement only

30" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible with Duct 8" High Standard Quality - Every+ Product Details Perfect Fit & Easy Sizing Designed for a 30" x 20" OR 20" x 30" duct opening (measured at the opening), with actual outer dimensions of 32. 5" W x 22. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 29. 75" x 19. 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