ABSTRACT
This chapter discusses the data and sample calculations and a design procedure for pressurizing control rooms. The same technique may be used to pressurize other buildings located in hazardous areas and to protect electrical equipment and large motors against corrosion, explosion, and moisture. Since cooling is attained by recirculation of chilled air, the amount of outside air is calculated to include air for pressurization, ventilation, and makeup air. To determine the outside air required for non-air conditioned buildings, both the solar load and the internal load must be calculated. The outside air needs to maintain building pressure depends on the required building pressure and on the air tightness of the building shell itself.
