There are many product options which will provide passive ventilation for new build and existing homes. As this is a relatively new concept to New Zealand, we have recommended the following range of product options as a simple and effective guideline.
The products have been selected to achieve the recommended airflow for roof pitches above 15° (10,000mm2 lin/m) and below 15° (25,000 mm2 lin/m).
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The Ridge Ventilator is designed to release warm air from the roof void. If the air is not released, condensation will form inside the roof and lead to structural decay and damp and mould in the home. This is a leading contributor to the extremely high level of Asthma and Respiratory diseases in New Zealand.
In a balanced system, wind blowing over the ridge creates a negative pressure that draws the warm air out of the attic/roof space. Replacement air enters through the under eave or soffit vents, bathes the underside of the roof, and exits at the ridge cap through the ridge vent. Even with no wind, the natural convection action of rising warm air maintains a continuous airflow along the underside of the roof. It is a system that works year round with no moving parts or energy consumption.
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