Air ducts are becoming one of the most important parts of a building. Instead of creating big windows in every room or different parts of building for the ventilation and proper air flow, people tend to install central air duct system. This is proving to be a very efficient approach. Now a days almost in every building, workplace or house there is an air duct system. Flow of the air inside our homes or workplaces now depend upon these systems. They conduct very essential job for us. Therefore, it becomes our responsibility that we handle these air duct systems very carefully as well. Another reason for this is that air duct system is very expensive. It covers a large part of the building as well. So to maintain the working of air ducts we must give proper attention towards their condition and cleaning situation.