Why choose natural ventilation?


Natural ventilation uses wind speed and temperature to achieve controlled ventilation, providing the benefits of natural air with the security and control of HVAC systems.

Natural ventilation is not a new concept. It has been part of Middle Eastern architecture for thousands of years, but became little used as air conditioning was introduced following World War II.

However, as environmental concerns have increased and sustainable design has become more desirable, natural ventilation has become the preferred system for schools and buildings.

Natural ventilation can also improve the health of the building's occupants, and has been proven to alleviate Sick Building Syndrome, improving concentration rates and reducing absenteeism.

The energy used by natural ventilation is minimal, with the motors used to power the dampers the only draw on natural resources.


Even hybrid systems, which are a combination of passive ventilation and fan assistance, are far more efficient than HVAC alone.

It therefore gives considerable cost savings through reduced construction costs, as well as reduced maintenance and running costs and free night-time cooling.

The ethos of a natural ventilation system is one that fully encompasses the occupants' requirements, the design and construction as well as the costs and benefits.

Flexibility and variation in design lead to an individual solution for each unique building.

Principles of natural ventilation...

tek intonat® offers a number of natural ventilation strategies depending on your aesthetic and ventilation requirements.

The Stack Effect

Stack effect is temperature induced. When there is a temperature difference between two adjoining volumes of air, the warmer air will have lower density and be more buoyant, thus will rise above the cold air creating an upward air stream.

In order for a building to be ventilated adequately via stack effect, the inside and outside temperatures must be different so that warmer indoor air rises and escapes the building at higher apertures, while colder, denser air from the exterior enters the building through lower level openings.

Stack effect increases with greater temperature difference and increased height between the higher and lower apertures.

The Wind Effect

The force of the wind is driven down into the room or space below and, having a greater density than the internal air, this cooler incoming air flows down to floor level, whilst the less dense, warmer internal air rises and exits through the passive or active stack quadrants as a form of displacement ventilation.

As the wind changes direction at roof top level the system quadrants also change their function to continually provide the incoming air and extract stale air from the building.

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