” How come we even have to have ventilation to start with? The answer is always to assist the health and fitness and wellbeing of indoor occupants by improving the quality of the air they breathe. Determine 1: Exhaust Ventilation Technique (DOE) Exhaust ventilation systems function by depressurizing a structure. https://cibse-cpd01122.educationalimpactblog.com/49727319/5-easy-facts-about-lift-shaft-ventilation-described