Comment by throwaway8877

Mechanical mentilation (with fans) is considerably better in many ways.

It allows heat recovery - less heating (or cooling) energy is wasted by proper ventilation.

Ventilation is constant - there is no buildup of CO2, moisture or harmful particles like VOC or viruses.

There is no need for discomfort caused by the shock ventilation when ventilation is properly dimensioned (enough for people in the room).