Ventilation is the process by which fresh air is introduced and contaminated air is removed from an occupied space.
Purposes of Ventilation
The purposes of ventilation are:
1. To provide a continuous supply of oxygen necessary for human existence.
2. To remove the heat, moisture and carbon dioxide from a room.
3. To remove contaminants such as:
Heat and smells from cooking
Gases and vapors from industrial processes.
Formaldehyde from; insulation foam, furnishings, wallpaper, carpets, resin in wood products and plasterboard.
Outdoor aerosol pollutants such as; smoke, soot, mist, fumes, pollen, plant fibers, mold spores, viruses and bacteria
Indoor aerosol pollutants such as; carpet fibers, furniture fibers, clothing fibers, skin flakes, mites, viruses and bacteria.
Typical Ventilation System
A typical plant layout is shown below.