Indoor air quality level is one of the indicators to determine the air quality of the office environment in term of the ventilation efficiency and adequacy. Thus,to ensure that all the air pollutants arereduced to the acceptable level, theASHRAE Standard 62 for Natural andMechanical Ventilation states that theminimum allowable rate recommended forthe office building is 20 cfm/person(ASHRAE, 2005). Following theobservations of Banaszak
et al.
(1970), theattention of the medical profession wasdrawn to the development of an allergicrespiratory disorder (allergic alveolitis)among the employees working in air-conditioned offices