The Exhaust Ventilation System is one specific type of commercial ventilation system that is usually found and very useful in cold climates. In warm climatic conditions where summer is hot and humid, the depressurization factor can draw the moist air into the wall cavities of the building causing moisture damage due to condensation. But is cooler climates this depressurizing ability reduces the air pressure inside below the outside air pressure. This enables in the extraction of indoor air from the house and air infiltrates through the leaks in the shell of the building through the intentional and passive vents to make it up.
Supply Ventilation System
This is another type of commercial ventilation systems that work by pressurizing the building. There is a fan used so that the outside air is forced into the building and the air leaks out of it through the holes in the shell and other intentional vents like the bath and range fan ducts. These systems are relatively inexpensive and very easy to install as well. A typical system can introduce fresh air into one or several rooms, depending on the design. It may also include adjustable windows or wall vents for different rooms. It allows better control of air entering the house and also discourages entry of pollutants from outside.
The Balanced Ventilation
Systems
Another type of commercial
ventilation systems
is the Balanced Ventilation System. This does not pressurize or
depressurize but introduces and exhausts in equal quantities of
outside fresh air and the inside polluted air. It has two fans and
two ducts to facilitate better distribution of fresh air. It is best
for those areas that have more human traffic and also for your
kitchen, bathrooms, and laundry room. This system does not temper
moisture or remove air before it enters into the house and use
filters for removing dust and pollen from the air outside before it
allows it to enter inside the house.


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