Exhaust Ventilation

  • Exhaust ventilation systems work by depressurizing a structure. The system exhausts air from the house, thus causing a change in pressure that pulls in make-up from the outside through leaks in the building shell and intentional, passive vents.
  • Exhaust ventilation is most appropriate for colder climates, since in warmer climates, depressurization can draw moist air into wall cavities where it may condense and cause moisture damage.
  • Exhaust ventilation systems are relatively simple and inexpensive to install.
  • Typically, an exhaust ventilation system consists of a single fan connected to a centrally located, single exhaust point in the house. A better design is to connect the fan to ducts from several rooms, preferably rooms where pollutants are generated, such as bathrooms and kitchens.
  • Adjustable, passive vents through windows or walls can be installed in other rooms to introduce fresh air rather than rely on leaks in the building envelope. Passive vents may, however, require larger pressure differences than those induced by the ventilation fan to work properly.
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