Ventilation

Rooftop installations (original state)
The ventilation of the building may have been all natural. In the rooftop, there are many chimneys, working as natural extractors thanks to the Venturi effect; and there is a big skylight and other ventilations that work as clean air intakes. The only mechanical extractor might have been in the cooker hood above the kitchen stove, powered by electricity.
Aside from the air ventilation of the house, there are another chimneys in the rooftop belonging to the sanitation installation, that avoid the suction of the water in the traps, and help to maintain bad odors out of the living spaces.
In the house's interior, there are air vents in the longitudinal wall in the middle of the floor plan that supply the stay rooms with fresh air, that move the foul air from them to the wet rooms, and then to the outside through the cooker hood in the kitchen or the windows in the bathrooms.

Bathroom (original state)

Ventilations along the longitudinal interior wall (pre-restoration state)

Fireplace chimney and other vent. ducts (pre-restoration state)
In this floor plan it is shown graphically how this hypothesis could have worked:

The building was very well ventilated, constantly renewing the house's atmosphere with fresh air from the natural environment in the land. Also, in addition to the vents and the bathroom windows, in the house there are other sliding windows that can be opened if needed.
This created a very healthy atmosphere in the interior of the building, but it had the downside of the need of heating to keep a comfortable temperature when it is cold outside.
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