Natural (or passive) ventilation in a building

As the name suggests, natural ventilation is a passive ventilation system that uses natural forces, such as wind and thermal imbalance, to move air to and from an indoor space. The function of these ventilation systems is to regulate the temperature of the internal air as well as to introduce fresh air and remove polluted air. This is made possible by opening and closing windows and openings in the walls that act both as a source of fresh air and as an outlet for polluted air. BV Froid, the expert in ventilation systems, explains the advantages of natural ventilation, how it works and in what type of building.

Factors affecting the air flow rates in a building

In a building, the air flow rates depend on :

  • wind direction and average wind speed;
  • how the building is subject to seasonal wind variations and how these change over the course of a day;
  • the design of the building – whether it promotes or restricts airflow;
  • the surrounding terrain and plantings, as these can impede airflow;
  • the orientation of doors and windows, skylights and ventilation shafts;
  • the average air pressure in and around the building.

Why opt for a natural ventilation system?

Five key advantages of natural ventilation can be cited as examples:

  • Reduced costs: because passive ventilation systems rely on natural forces, you will save considerably on your building’s energy consumption and thus reduce your energy bills.
  • Low maintenance: Passive ventilation requires no maintenance, which again reduces costs and saves you time and effort.
  • Cleaner air: Natural ventilation systems ensure that clean air circulates in your building at all times. This improves air quality which, in turn, preserves the health of the occupants and will increase their productivity and concentration levels.
  • Reduced CO2 emissions: By implementing a passive ventilation system in your home or workplace, you will also help to reduce greenhouse gas emissions such as CO2.

Building your natural ventilation system

Natural ventilation is incredibly versatile. When it comes to a finished building, there are many options for adding a passive ventilation solution to the systems already in place. The new natural ventilation system will complement your existing system to take advantage of natural forces. For a new building, BV Froid can advise you on the best options for a passive ventilation system.

In what type of building can natural ventilation be used?

Almost all buildings can accommodate passive ventilation systems, including office buildings, schools, theatres and hospitals. Companies that provide this type of installation have a mission to ensure excellent and safe indoor air quality through passive ventilation for the benefit of people, productivity and the environment.

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