4th September 2019
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What is passive stack ventilation (PSV)?

Also known as a System 2 ventilation system. The use of a passive stack ventilation (PSV) system is one alternative to provide domestic ventilation. This utilizes a mixture of the air flowing across the ceiling and the natural buoyancy of hot humid air to raise the humid, stale air from the kitchen bathroom, cloakroom, etc. up to the point of the roof ridge where it flows into the atmosphere.
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