In an office, it is certainly necessary to have a healthy Indoor Air Quality so that dedicated employees can work effectively to their jobs. Especially, cleaning the duct system on a regular basis is important. However, to keep the office clean would help the growth of the company success because healthy employees can work well and accomplish their tasks with hygienic environment. Moreover, good quality air inside the office can help employees to be more productive as well as for the business will gain more revenue. With totally clean duct system inside the office may bring positive results and keep the employees motivate to work because of the pleasant Indoor Air Quality.