The following are available exhaust devices to choose from when installation an attic ventilation system:

Ridge Vent

Ridge vent is a fixed exhaust component installed along the ridge of the roof. There are three main types of ridge vent: shingle-over, metal, and non-baffled continuous.

Shingle-Over

This is the most attractive and efficient ventilation device. Its low profile design minimizes its appearance on the roof, while its external baffle provides maximum air flow. It is installed along the ridge of the roof beneath the ridge shingles. This type of ridge vent creates the greatest air flow in all wind conditions by creating a negative air pressure that effectively pumps air from the attic.

Metal

This is an aluminum version of the shingle-over type, but with a little higher profile. It is also installed continuously along the ridges of a roof and operates with an external baffle.

Non-Baffled Continuous

These vents are available in various styles such as rolled and corrugated. Studies have shown that these types do not create negative air pressure and are not as efficient. In fact, in windy conditions they can actually cause air to flow into the attic.

Power Ventilators

These are exhaust vents with an electric motor-driven fan. They usually come equipped with a thermostat to automatically come on when attic temperatures rise. Some power vents also have humidistats to start the fan when moisture removal is needed. Powered fans can also be installed where some fixed vent systems wouldn't work as well.

Static Vents

These are roof louvers that act as fixed exhaust vents. They are high-profile and come in different metal finishes to match your home. They allow only a small confined area of air movement. Air flow does not move along the entire underside of the roof deck, therefore multiple vents must be installed to provide adequate ventilation.

Turbine Vents

These are wind-driven exhaust fans with a very high profile. They are metal and are available in black, brown, or mill finishes. They provide limited air movement at most wind speeds and are best applied in climates where consistent wind speeds of 5mph can be expected.

For more information on ventilation see FAQ - How important is ventilation?