Airflow through large openings and gates

The pressure change outside the building envelope with such an opening is illustrated in Fig. 7.103. The outside air static pressure, is greater than 

FIGURE 7.103 Pressure distribution inside and outside a building with a single large opening. 

CHAPTER 7 PRINCIPLES OF AIR AND CONTAMINANT MOVEMENT INSIDE AND AROUND BUILDINGS 

The airflow rate through an opening area with a height of dh can be calculated as 

The infiltrating and exfiltrating airflow rates can be calculated using the following equations  

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