The practice of providing regularly spaced or continuously protected (e.g., louvered) openings along a roof edge or perimeter, used as part of a ventilation system to dissipate heat and moisture vapor.
Tag: vent
Exhaust Ventilation
Air that is vented or exhausted from the roof cavity, typically through vents installed on the up slope portion of the roof. For example, with most steep-slope roof assemblies, exhaust vents are typically located at or near the ridge.
Intake Ventilation
The fresh air that is drawn into a passive ventilation system through vents typically installed in the soffit or eave of a roof.
Moisture Relief Vent
A venting device installed through the roofing membrane to relieve moisture vapor pressure from within the roofing system.
Net Free Vent Area
The area (measured in square inches) open to unrestricted air flow and commonly used as a yardstick to measure relative vent performance; the area of the opening of a vent minus the area displaced by the screening material.
Ridge Vent
A ventilator located at the ridge that allows the escape of warm and/or moist air from the attic area or rafter cavity.
Soffit Vent
A premanufactured or custom built air inlet source located at the downslope eave or in the soffit of a roof assembly.
Vent
An opening designed to convey air, heat, water vapor or gas from inside a building or a building component to the atmosphere.
Ventilator
An accessory that is designed to allow for the passage of air.