supply ventilation systems

 supply ventilation systems
supply ventilation systems work by pressurizing the building. they use a fan to force outside air into the building, while air leaks out of the building through vents in the trunk, bathroom and range fan ducts, and deliberate vents. diagram of a home's supply ventilation system, including airflow direction, infiltration, and positive pressure.
 supply ventilation system
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as with exhaust ventilation systems, supply ventilation systems are relatively simple and inexpensive to install. a typical system usually has a fan and duct system that delivers fresh air to one – but preferably several – rooms most occupied by residents (e.g. bedrooms, living room, kitchen). this system may include adjustable window or wall vents in other rooms.
supply ventilation systems provide better control of the air entering the house than exhaust ventilation systems. these systems pressurize the house, preventing the entry of pollutants from outside and preventing the withdrawal of combustion gases from fireplaces and appliances. they also ensure that the air entering the house is filtered to remove or dehumidify pollen and dust.
features of supply ventilation systems
supply ventilation systems work best in hot or mixed climates. because they pressurize the home, they have the potential to cause humidity problems in cold climates. ın winter, the supply ventilation system causes warm indoor air to leak through random openings in the exterior wall and ceiling. ıf the indoor air is humid enough, some moisture can condense in the attic or sections of the exterior wall, where it can encourage mold, mildew, and rot.

like exhaust ventilation systems, supply ventilation systems do not soften or remove moisture from the air before it enters the house. thus, they can contribute to higher heating and cooling costs compared to energy recovery ventilation systems. because air enters the house from different places, outside air may need to be mixed with indoor air before delivery to prevent cold drafts in winter. ın-line duct heater is another option, but it will increase operating costs.
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