Once, air supply was partially secured through the areas of the building structure, which were not airtight, through which the fresh air flowed in.
The outside walls of individual multi-apartment buildings have built-in channels for the supply of fresh air.
When renovating buildings, replacing windows, performing works to ensure heat insulation and airtightness of the building, as well as various indoor repairs, areas lacking airtightness and air supply channels are often closed with different solutions, resulting in a lack of natural supply of fresh air.
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