LEDwholesalers GYO2302 6-Inch Hydroponic Carbon Air Filter 650 CFM Activated virgin carbon removes 99.7 percent of volatiles from the air; 6-inches flange diameter and 10-inches diameter and 20-inches height Carbon type active ctc60; package content (1x) 6 carbon air filter Average life expectancy 1.5 years Package Content (1x) 6 carbon air filter