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In modern office consist of AC systems with lot of electronic equipment such as computers, printers, scanners, photocopiers and etc to work efficiently and effectively. The indoor air quality is depended on the good ventilation system inside the building. Therefore indoor and outdoor air should be mixed to create healthy environment inside the building. But because of the modern electronic equipment and AC system there is less possibility to create healthy environment inside the building as not mixed with out door air. Therefore it is important to emphasize the importance of indoor air quality for long time survival of the people who work in those environment.