Natural cross ventilation, which occurs when an internal space has two or more openings on different orientations so that breeze can flow through the space to flush out hot and/ or stale air. Data on cd for natural ventilation openings is limited particularly its variation with wind direction. This guide describes how our calculators can assist when designing operable windows for natural ventilation and verify the design.
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Cd is one of the main difficulties in manual calculation procedures and in network flow.
The typical method of compliance with clause g4 of the new zealand building code is to provide an opening window area equivalent to 5% of the floor area of a building.
When trying to determine the light and ventilation requirements for a room, an adjoining room can be considered as a portion of the room first room when the opening between them complies with this. 1.2.2 natural ventilation of occupied spaces must be achieved by providing a net openable area of windows or other openings to the outside of no less than 5% of the floor area.
