Some improvements in the appliances for the rational renovation of air in rooms (Machine-translation by Google Translate, not legally binding)

摘要

Improvements in the devices for the rational renovation of air in the rooms, which are mainly characterized by establishing two units of electric fans mounted with their parallel axes on a same rigid panel adaptable to the plane or ceiling of a window, rotating the axis of one of these units in the opposite direction to that of the other; or, what is the same, extracting one of them the air inside the room and injecting, the other, the outside air into the same room. (Machine-translation by Google Translate, not legally binding)