The advantage of aeration is that air exchange is created without the help of fans, without consuming electricity. However, aeration provides only general exchange ventilation and does not provide cleaning of supply and exhaust air.
Mechanical ventilation systems can provide local ventilation.
The supply systems of mechanical ventilation supply purified air with a set temperature and, in some cases, humidity to the working area of the workshop to ensure the required sanitary and hygienic conditions for people and equipment inside the building. Mechanical ventilation exhaust systems remove dusty and polluted air, purifying it if necessary before being released into the atmosphere.
Supply ventilation systems consist of the following main elements: an air intake device, an intake chamber, which includes an insulated valve, a filter, an air heater (heater) and the fan, the network air ducts and air distributors, as well as regulating devices (diaphragms).
The air intake device is located in the least dusty area of the site, but as close as possible to the supply chamber or on the roof. At the entrance to the air intake shaft or channel, a louvered grille is installed to protect against atmospheric precipitation and from foreign objects. An air intake shaft or channel is made in building structures made of brick or concrete. Sometimes one intake duct feeds several supply systems with external air.
An insulated valve (flap) with manual or electric drive is installed between the air intake device and the filter of the supply chamber. When the fan is not working, the valve must be closed to protect the supply chamber equipment from outside cold air.
The supply chamber consists of a louvered grate, a filter for air purification, heaters for heating it and a fan with an electric motor. Supply chambers can be installed on a foundation or a platform, or suspended from ceiling structures of coatings. No fencing is required for these cameras.
Air ducts of supply systems are usually made of thin – sheet galvanized steel roofing with a thickness of 0.35–1.4 mm. The air ducts can be of round or rectangular cross-section. Metal ducts are quickly mounted, are strong enough and have good tightness. When laying air ducts under the floor, they are made of concrete or brick.