Mechanical ventilation programs use fans, ducts, together with other mechanical parts to control the circulation of air out and in of the developing. Exhaust Vents: These vents expel stale or polluted air through the building. They are commonly located in places like kitchens and bogs wherever moisture and odors accumulate. https://ventilationinstallation81123.theideasblog.com/38106456/the-single-best-strategy-to-use-for-ventilation-ductwork