Ventilation is a process when used air is removed and replaced by outdoor air. Along with this process when it is necessary air is filtered, heated or cooled, moistened or drained.
If you feel the symptoms of eye irritation, dry lips, dryness in the throat and nose, thus it means that the room air is too dry or it could be the consequence of factors related to household activities.
It is difficult for a human to determine air humidity only by his senses. Such sensations, that we usually consider as the signs of dry air, also can be caused by airborne dust or other impurities. The sense of dryness could arise due to the fact that it is simply too warm in the room. In this case the simplest solution is to ventilate the premises and to decrease the temperature by a few degrees.
The premises should be ventilated regardless of the season. Mechanical, automated systems constantly ventilate your premises thus ensuring a comfortable and healthy environment in your premises.
Too warm and unventilated spaces decreases human efficiency, provoke deterioration of health and frequent headaches. Room temperature during the cold period should be 18-22 degrees Celsius.