Threats occurring in the functioning of shelter ventilation installations

Ventilation of facilities such as shelters is a very complex issue. First of all, such an object should be extremely tight so that intentional air pollution outside does not pose a threat to people inside. Secondly, the system must be characterized by high reliability, because for airtight objects the failure of the air conditioning system is also a threat to people inside. Thirdly, the system must provide microlimatic vacancies inside acceptable by people passing through the shelter - it is mainly about temperature and humidity.