ABSTRACT
Ventilation and Ÿltration are critical for controlling airborne microbial —ora, and various guidelines provide detailed recommendations for both. The use of ventilation air to provide pressurization control for isolation hospital rooms and wards has been addressed in the previous chapter. Ventilation air also serves to dilute airborne microbial concentrations with outdoor air and to remove microbes generated internally in the hospital environment via outside air exhaust. High efŸciency Ÿltration protects against the intrusion and spread of airborne pathogens and allergens in the hospital environment. This chapter addresses the effectiveness of these technologies for controlling air quality based on both empirical evidence and analytical evaluation.
