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How Ventilation Works:

Since warm air rises, an effective sytem will include exhaust vents near or at the ridge. That placement allows the hottest air to be removed from the attic most efficiently. Second, the thermal effect creates a natural circulation of air, because as warm air rises, cool air falls. A well-designed system assists this momentum by placing intake vents at the lowest point in the attic, typically in soffit. The cool air entering these vents speeds the circulation of air.		  

Source: Principles of Attic Ventilation,
Sixth Edition. Air Vent Inc. www.airvent.com
Ventilation

What is the purpose of attic ventilation ?

  • Duringing warmer months, ventilation hleps keep attics cool.
  • During colder months, ventilation reduces moisture to help keep attics dry. It also helps to prevent ice dams.

The illustrations here show the dramatic effects of ventilated versus unventilated attics in colder and warmer months.
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