Rooftop ventilation systems can be incorporated into a building to provide or supplement the overall system of air exhaust and make up air control.
Such systems can improve indoor air quality, occupant environmental health and may prevent condensation and premature aging of the rooftop and associated building assemblies, can significantly reduce building temperatures to save energy in the summer months.
Generally, both combustion air and fresh will intake requires equal displacement, so where indoor and outdoor air are exchanged, a single opening may not suffice. In most cases a corresponding inlet or exhaust must be included in the building to allow for the system to function.
These are general guidelines, but local code requirements vary.
The video below shows an example of a passive turbine vent.
The turbine vent harnesses both wind power and the power of the heat stack effect, a long recognized phenomenon of the rise and associated draft of warm air. Geographic areas known for extreme winds may not be optimal for passive turbine vents but generally stable prevailing regions work well for turbine vent systems.
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