Ducts tend to get dirty even if you are not able to sense it with naked eye. They absorb dirt on daily basis and also various kinds of contaminants find ducts a good place for their growth. Yeast, moulds, bacteria and other pollutants get accumulated in the ducts thereby making it dirty and unhealthy for the inhabitants of the house. The air that you breathe, coming through these ducts, becomes more polluted each day and this could be fatal for you. Thus, it is advised to get your ducts professionally cleaned twice a year by professionals like SK Cleaners.