The importance of good ventilation

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Whether we are in our home or at our workplace, installing a Ventilation and ventilation system is mandatory to preserve our health. Without it, the air in rooms heavily polluted by its occupants or by various pollutants (radioactive gas, Volatile Organic Compounds, formaldehyde, etc.) would be unbreathable. To constantly renew the air, several devices can be put in place, including the VMC, often installed in new private homes and air extractor fans that the professional sector uses widely.

Two types of pollution in the workplace

The law requires both individuals and professionals to set up devices capable of driving impure air, more commonly known as "stale air", in order to to limit the risk of respiratory diseasess, allergic, etc., but also for protect employees or particulars of a fire or explosion due to the dispersion of a flammable product in the air. To comply with the Labor Code and ensure a state of purity in the atmosphere, several solutions exist: install an air extractor fan or set up mechanical ventilation.

On this subject, VIF Ventilation has a whole catalog of industrial air extractor fans (axial, centrifugal, helical) perfectly adapted to the constraints of industries, craftsmen and communities. The choice of the two solutions takes place vis-à-vis the specificities of workplaces and the nature of pollutants potentially present in the air.

Non-specific pollution: less restrictive

Before detailing the main existing solutions, it is important to dwell on some notions in order to understand the whole subject. When we talk about pollution, we tend to see big smoke coming out of factories or car exhausts. Gold, a polluted air is also an air breathed by people and therefore depleted of oxygen and overloaded with CO2. This type of pollution is called nonspecific pollution, that is to say a pollution inherent to the human presence. This is particularly the case in offices, coworking spaces, meeting rooms, etc.

Workplaces that only have this type of pollution have fewer aeration requirements. Indeed, only mechanical ventilation ventilation is required. Ventilation with openings (doors, windows, windows) also called permanent natural ventilation is also possible, but under certain conditions (C. trav., Art R. 4222-4 and s.).

Specific pollution: the one to treat absolutely

Specific pollution in the workplace concerns all other pollutants which are not related to the human presence. In short, all that can generate pathologies due to the breathing of irritating, toxic, corrosive gases or particles for the body. This may include various glues for furniture and coatings, coatings, floor care products, walls and surfaces, hydrocarbons, radioactive gases, etc., and any other substance considered dangerous to health in any form be (gas, vapor, aerosol, etc.).

In the same way as nonspecific pollution, these rooms in contact with these pollutants must guarantee the same air renewal capacity provided by mechanical ventilation. But in addition and according to the limits set by the Labor Code, they are obliged to respect the concentration rate of dangerous substances (gases, aerosols, dust) present in the air. For example, in the context of alveolar dust, the employee on the totality of his working time must not inhale more than 5 mg / m³ of air. Thus, according to the pollutants inhaled, exposure limits are determined and must be the subject of special arrangements.

How to remedy specific and non-specific pollution

The problem is, it is now a question of making the right decisions to guarantee a healthy air to all occupants of the premises. You have to go step by step to determine your own needs.

First, the ideal solution consists of completely remove the pollutant in order to avoid its dispersion at the moment of its production. For this, there is no other way than to collect pollutants locally, that is to say directly to the source of emission. This evacuation has the advantage of not penetrating the pollutants into the airways of employees and to preserve the quality of the air in the room.

Unfortunately, this arrangement is not always feasible. In this case, there is no choice but to allow the pollutant to disperse in the air. IIt will then be necessary to play on the limits imposed by the legislators and to try to regulate the concentration of toxic products in the air by the massive influx of fresh air into the room. This supply of outside air, supposed to be healthy, will reduce concentrations and mechanically limit the amount of polluted air that each employee will inhale during his working day.

VMC or air extractor?

In general, we prefer VMC in places where pollution is said to be nonspecific. Less powerful than the air extractor, the VMC is suitable for offices and private homes. However, be aware that it must first think of its installation from the construction of his house. Although it can be installed during a renovation, it will require more substantial work.

But nothing prevents to install an extractor fan in your habitat if your VMC is defective. Obviously, several ranges are marketed, some adapted for non-professional use.

As to air extractor fans, by their power and their different functionalities (extracting hot air, unpleasant odors, smoke, evacuate moisture, etc.), they are more adapted to more harmful environments and dangerous for the health of the man. This is how they are privileged in industries, crafts and communities.

Its choice must be based on the number of occupants present in your room and the surface of the latter. For this reason, we recommend you to get closer to specialized stores that can guide you on personalized solutions.

To learn more or ask a question, visit our forum insulation, heating and ventilation


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