Mechanical ventilation

Mechanical ventilation defers from natural one in capability to purify extract air before its ejecting into the atmosphere, catch airborne contaminants and provide air conditioning in the workplace. Besides, it makes possible to arrange air intake for input ventilation in the least contaminated zones of an enterprise or even beyond it.

General ventilation provides air free of contaminants and conditioning in whole work area. It’s applied to extracting overall heat with the air that has no toxic emission, and also when it’s impossible to use local ventilation for technological reasons.

If gases or vapors spreading in the work area are denser than air general ventilation should provide 60% air extract from lower zone of area and 40% - from upper one.

Input and extract ventilation with general input and local extract from the place where contaminants are emitted is the most practicable for occupational condition.

In work area, which atmosphere contains great quantity of gases, vapors and dusts extract ventilation should be 10 % greater than input one, what prevents pushing contaminants from that area into the neighboring.

Ventilation system can use for input not only outside air but also air of the work area after its purification. Such repeated use of the air is called re-circulation recommended in cold year period to keep warm inside.

Local ventilation as the general one can be input and extract.

Local ventilation is performed as airflow shower, air and air-heated curtains used for focused air input.

Airflow shower is aimed to protect workers from overheating in hot workshops, air and air-heated curtains prevent work areas from incoming of outside cold air.

Local extract ventilation works by means of extract hoods, panels etc. It should provide maximum catch of contaminants with minimum quantity of extracted air.

To choose appropriate ventilation system they consider characteristics of harmful emission (temperature, vapor density, toxicity), worker position in the workplace and technology.

Emergency ventilation is installed in the work areas where harmful or explosive gases may be rapidly evolved into the air in great quantity. Gas generator and compressor areas are referred to such work areas. Emergency ventilation is only extract.