The Impact of Simplified Window and Exhaust Fan Assumptions on Model-Based Predictions of Inter-Zonal Air Flow and Contaminant Transport in Multifamily Buildings

In residential buildings, the indoor air quality can be significantly affected by ventilation measures initiated by occupants, including the operation of windows and in-unit exhaust fans in kitchens and bathrooms. The outcome of these measures can be highly variable and difficult to accurately characterize in building simulation frameworks. Consequently, many simulations simplify these factors by disregarding window opening behaviours and using fixed schedules for exhaust fan operation across all residential units.