The different types of roof ventilation options include box vents, wind turbines, power vents, ridge vents, off ridge vents, cupola vents and soffit vents. Which type is installed depends on the type of building and owner's preferences.
Box vents are static vents that have no moving parts. They are usually placed near the roof ridge, and natural convection allows for rising hot air and moisture to escape through them.
Wind turbines are not static but do have moving parts that use the wind to power their movement. The wind spins the hood and draws hot air and moisture out of the attic.
Power vents have motors that drive large fans to move hot air and moisture out of the attic. Some have thermostats and humidistats that turn the vent on when the temperature or humidity levels reach a certain point.
Ridge vents are static and have no moving parts. They usually run the entire length of the roof’s horizontal ridge and provide an even distribution of air temperature.
Cupola vents sit on top of a high ridge and over an opening in the roof, allowing hot air and moisture to rise and escape out of the building. These types of vents are usually decorative and are often used in conjunction with other roof vent systems.
Soffit Vents are installed in soffits and eaves and bring air into the roof’s ventilation system. These are most effective when used along with a ridge vent.