6" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 8.5" x 8.5"] Round Damper Ring + Product Details Size –

+ Product Details Size – 22" x 30" or 30" x 22" is the size for the duct opening measurement only

+ Product Details Size – 6" round duct opening-

+ Product Details Perfect Fit & Easy Sizing - Designed for a 20" x 12" OR 12" x 20" duct opening (measured at the opening)

+ Product Details Size - 22"w X 14"h is the size for the duct opening measurement only

Rigid Built For External Use – The sturdy and rigid design features noise-free components that eliminate vibration and excess noise to the louvers

6" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 8.5" x 8.5"] Round Damper Ring + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 6" x 6" duct opening (measured at the opening), with actual outer dimensions of 8. 5" W x 8. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 5. 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 from strong,