» Posted by on Apr 25, 2018 in Uncategorized | 0 comments

The V in HVAC stand for Ventilating or ventilation. Ventilation is the process of making available quality air through the exchange of outdoor air for indoor air in any space or environment where people inhabit. The exchange involves the escape of airborne contaminates such as moisture, odors, smoke, heat, dust, airborne bacteria, carbon dioxide,  chemicals emitted from furniture within and other form of gases, and the replenishment of oxygen. Ventilation helps in the removal of offensive odors, too much moisture, and airborne toxins in the environment. It allows for the introduction and distribution of outdoor air, and prevent the stagnation of indoor air. The exchange of indoor air and outdoor air and maintenance of quality indoor air in buildings is an important function of the HVAC system which is designed to provide thermal comfort for occupants on a building space whether on land or water or air.\


There are two primary methods of providing ventilation in a building. They include:

  1. Mechanical or forced Ventilation

The mechanical or forced ventilation system is installed through the aid of an Air Handler (AHU). This method is used to achieve and control indoor air quality. As opposed to the natural methods of ventilation, achieved with the replacement of indoor air with outdoor air, in instances of humid climates, extra energy is often needed to exit excessive moisture from the air. Examples of places where the mechanical or forced ventilation is often used include kitchens and bathrooms. Kitchens and bathrooms especially have exhausts that are mechanical. These exhausts are used to control offensive smell and maybe used for humidity as well.  When designing a mechanical ventilation, certain factors needs to be considered. These factors include the flow rate and noise level. Ceiling fans, table fans and floor fans can also be used to achieve mechanical ventilation. Fans can be used to circulate the flow of air within. This reduces the hot temperature. When hot air arises, ceilings fans become useful in keeping a room warm especially in winter.


  1. Natural Ventilation

As the name suggests, this type of ventilating system is achieved through natural means. Natural ventilating system is typical of the escape of hot air trapped within to allow for the entry of air outside without the use of fans or any mechanical system. The only thing needed is to provide aero spaces within the building. This is achieved through windows, louvers, etc. Unlike the mechanical ventilating system, natural ventilation requires little energy. However, as noted in mechanical ventilation above, natural ventilation might not be effective in maintaining thermal comfort and quality air production and control in warm or humid induced environment. In cases such as this, air conditioning systems are provided as supplements to the natural ventilating system.s




  1. Thermal Comfort: The primary benefit of a ventilating system is to provide thermal comfort for occupants in a room. When air within becomes hot and uncomfortable, fresh air from outside is needed to replace hot air trapped within which has to be exited.
  2. Removal of Toxins: Humid areas allows for the emission of airborne toxins and contaminants. With the aid of a proper ventilation system, these toxins are removed from the environment.
  3. Prevention of Airborne diseases: Natural ventilation especially can help reduce and prevent the risk of airborne illnesses such as tuberculosis, influenza and mengitis.

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