MountainAir Carbon FilterOverview MountainAir offers growers two ranges of carbon filters including "Big Air T Series" and "MA Carbon Filter." A carbon filter is the most efficient way to clean the extracted air from the grow room and remove odours. The air filter works based on adsorption. The odour molecules stick to the inner side of the activated carbon. The carbon doesn't increase its size. Growers use the premium filter to ensure an odourless extraction air. General