Calle 50 is the name used for Avenida Nicanor de Obarrio, which crosses the Bella Vista and San Francisco corregimientos. The banking district is here, with bank headquarters, offices and hotels. In the 1930s and 1940s it was the outskirts and houses were built along it, and with the rise of the banking center the headquarters arrived.
In a tower on this avenue, the ductwork is usually split between the building management, which looks after the risers and the central network, and each tenant company, which looks after the units and branches on its floor. That is why the visit is agreed with both, and the report shows which section belongs to whom. The area is about 3 km by road from the Climatiza office, in an approximate calculation.
Data point: In an air system that looked clean to the naked eye, 10⁵ to 10⁶ viable bacteria per cm² were counted on the coil fins (Hugenholtz and Fuerst, 1992). It is a case measured in a single system, not a general figure, which is why the camera looks inside before deciding.