Ventilation industrielle pdf

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Hide this message. Applies to England Documents. Request an accessible format. Suivi du portefeuille client Module de calcul de chute de tension Eglise-Anglaise 6 Ch. Le service compte 18 collaborateurs, incluant le responsable, les techniciens de projets, les chefs de chantiers et les monteurs CFC.

Courant fort 3. Courant faible 3. Suis- je conforme aux normes? Travail sur chantier 5. Les protagonistes 6. Par exemple, le code Insertion des prestations 7. Il faut donc aller puiser dans ses talents de commercial pour obtenir les meilleurs tarifs possibles. In order to have an effective ventilation system, fans must be the appropriate size and type. They must provide enough speed air movement to capture contaminants at the source, draw them through the hood, and carry them through the duct system, through the air cleaning devices and exhaust to the outdoors.

There are three basic types of axial fans: propeller, tubeaxial, and vaneaxial. Propeller fans are most commonly used for dilution ventilation or cooling. These fans are often mounted in a wall or ceiling. Common examples are your automobile radiator fan or a free standing room fans.

The basic characteristics of these fans include that they:. Tubeaxial and vaneaxial fans are essentially propeller fans made to fit in a duct. The fans in your home furnace, vacuum cleaner and hair dryer are examples of centrifugal fans.

They can operate against a high resistance and are typically used in local exhaust ventilation systems. The rugged radial blade centrifugal fans are the best type for exhausting heavy amounts of dust because they are less likely to become clogged or abraded by the dust. Figure 1 Types of fans. Selection of the proper fan can be complicated and should be done by a ventilation or fan expert.

However, you can make the following observations to determine if the fan selected is appropriate:. You may or may not know how much air has to be moved by the fan. You may also not know the amount of resistance in the exhaust system that the fan has to overcome and what is the fan efficiency. However, the following general information may be helpful:.

Safety guards are required for all danger points such as inlet, outlet, shaft, drive and cleanout doors. Construction should comply with applicable provincial governmental safety requirements. A hood — correctly called a local exhaust hood — is the point where contaminated air is drawn into the ventilation system.

The sizes and shapes of hoods are designed for specific tasks or situations. The air speed velocity at the hood opening and inside the hood must be enough to catch or capture and carry the air contaminants.

To be most effective, the hood should surround or enclose the source of contaminant or be placed as close to the source as possible.

Examples of completely enclosed hoods all sides enclosed are glove boxes and grinder hoods. Examples of partially enclosed two or three sides enclosed hoods are laboratory hoods or paint spray booths.

The enclosing hood is preferred whenever possible. Figure 1 Partially Enclosed Hood. For example, a type of receiving hood called a canopy hood receives hot rising air and gases as shown in Figure 2.

An example is a canopy hood located over a melting furnace. Figure 2 Receiving Hood. These hoods are located next to an emission source without surrounding enclosing it. Examples are a rectangular hood along the edge of a tank as shown in Figure 3 or a hood on a welding or grinding bench table figure 4 or a downdraft hood for hand grinding bench figure 5. Figure 3 Capturing Hood. Figure 4 Capturing hood for welding or grinding bench. Figure 5 Downdraft Hood for hand grinding.

Any air motion outside of the hood and surrounding area may affect how the air flows into the hood. The ventilation system will require a higher airflow speed to overcome air disturbances.

As much as possible, the other sources of air motion should be minimized or eliminated for the ventilation system to work effectively. Most of the capture velocities are around feet per minute fpm. How fast is fpm? Blowing lightly on your hand so that you can just barely feel air movement is about fpm. If opening windows or doors is unsafe, consider other approaches for reducing virus particles in the air, such as using air filtration and bathroom and stove exhaust fans.

Use fans to move virus particles in the air from inside your home to outside. Consider using a window exhaust fan if you have one. Be sure it is placed safely and securely in the window.

Another option is to place a fan as close as possible to an open window or door, blowing outside. Filter the air in your home. Consider using a portable air cleaner. Turn on the exhaust fan in your bathroom and kitchen. Use fans to improve air flow. Place a fan as close as possible to an open window blowing outside. This helps get rid of virus particles in your home by blowing air outside. Even without an open window, fans can improve air flow. Point fans away from people.