About Vents and Venting Systems
Vents and venting systems are individual products or complete systems that allow for the exchange of air from or within an enclosed area. Categories include attic vents or roof vents, foundation vents, ventilators, exhausters, and building-wide fans. There are two main types of attic vents: attic exhaust vents and attic intake vents. Like roof vents, these vents and venting systems are designed to regulate temperature and humidity. They differ in terms of size, cost, power source, and materials of construction. Foundation vents carry similar product specifications, and can help prevent damp-rot that is expensive to repair and which may attract termites. Ventilators and exhausters are vents and venting systems that may be designed specifically for commercial, residential, or industrial applications. Specialty products include belt-driven roof vents, eve vents, gable-end vents, hooded roof vents, roof exhausters, roof ventilators, and soffit vents.
There are three types of attic exhaust vents and roof exhaust vents: ridge, power, and static. Ridge vents are vents and venting systems that run the entire length of a roof’s peak and blend into the roofline for aesthetic purposes. They are often used with external baffles, an internal weather filter, and under-eave venting. Power vents have a motor, a temperature sensor, and a series of blades. When the temperature in the attic reaches a pre-defined threshold, the fan turns-on automatically. Some power vents also include a humidistat, a device which monitors moisture levels in the attic air. Static vents include roof louvers, wall louvers, and wind turbines. Roofing contractors select roof louvers because of their relatively low cost, but install wall louvers (which provide limited airflow) only in the gable end of the attic. Turbine roof vents are non-electric vents and venting systems that catch the wind use rotary motion to remove hot, humid air.
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Engineering Web: Vents and Venting Systems
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