The formation of drafts, as a rule, occurs in almost completely enclosed space in which there are small holes in the ajar Windows, doors, cracks or other such phenomena. If pressure, temperature or other characteristics of the air in this room differ significantly from those characteristics of the environment in the space outside the premises, formed the directed air flow passing through said holes. At the same time, the more significantly is the distinction between such parameters inside and outside the room, the more intense will be the draft.
Most often, the draft is formed in a situation when such openings in the closed room opposite each other. In this case, the speed of movement of air flow will be maximal and can reach values of 1 meter per second. In this case, since the volume of the air mass inside the room, much less than the mass of the air outside the environmental parameters in case of draught over time closer to options outside. For example, if a draft blows in from the streets, where the temperature is much lower than in the room, the room temperature will also be reduced.
The risk of draught
The draft has a certain risk to the health of people residing in the premises, subject to their occurrence. The main negative impact of the draught on the health status due to the fact that he is not absent-minded, and directed flow of air. Therefore, if a person, for example, always sits on the site, through which passes a through air flow, it undergoes intense impact. This can be especially dangerous if the temperature of the stream significantly below the prevailing room temperature.
Accordingly, the unpleasant symptoms that can be caused by draught, are in clear relation to the location of the air flow on the human body. So, if a draft blows in the face or head, you may experience inflammation of the ear, throat or nasal cavity, the herpes outbreak. The draft, aimed at the chest or waist, can cause inflammation of the corresponding nerves that will cause pain when moving and breathing. In addition, the possible occurrence of inflammation in the internal organs - such as kidney disease.