Powermaxx GLX-CF4 4" Premium Carbon Charcoal Ordor Control Filter 1050+ IAV Australia charcoal Removes 99.5% of airborne odors, Pre-filter included Air Flow - 200 CFM Flange Diameter: 4" - Height: 14" - Carbon Height: 12" - Width: 8" - Carbon Thickness: 2" 18 Months Average life expectancy & Maintenance free design