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Artificial (mechanical) ventilation
is the mechanical organized air exchange aimed at 
providing a physical state and chemical composition of air to hygienic standards. 
Aeration
is the natural, organized and controlled ventilation.
Efficiency of ventilation
is a providing in production rooms of level of the harmful and 
dangerous factors which aren't exceeding hygienic standards. 
Productivity of ventilation
is amount of the given or deleted air ventilation in m3/h. 
Air exchange
is the excision and air supply organized by action of natural or mechanical 
ventilation in the production room. 
Balance of air 
exchange compliance of amount of the given air deleted by air ventilation. 
Frequency rate of air exchange
is the relation of hour volume of the deleted or given air to 
the total structural volume of the room; 

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The recycling
is a full or partial return to the room of the air deleted by the exhaust 
ventilation. 
The air douche
is the stream of affluent air referred on the worker for the purpose of the 
prevention of its overheat. 
The deflector
is an exhaust mine with ogolovky a special form, providing the most effective 
excision of air from the room under joint action of thermal and wind pressures. 
Ventilating installation
is the ventilating equipment united in one unit (for excision or air 
supply). 
The ventilating system
(ventilation system) is a fan or вентагрегат with network of the 
artificial airways equipped airdistributing or airintakes which can be supplied also with devices for 
adjustment, control, heatmoist processing and purification of air. 
Pesticide 
is the substance, or an admixture of substances of a chemical or biological 
parentage applied to extermination of harmful insects, rodents, weeds, originators of diseases, 
animal, and also used as a defoliant, a desiccant and the regulator of body height of plants.