We report some studies made by Francisco de P. Rojas and Jose Vallhonesta, who were industrial engineers, professors at the Industrial Engineering School and members of the Royal Academy of Sciences and Arts in Barcelona in the second half of the XIX century. These scholars addressed the problem of ventilation and proposed some solutions to improve air quality not only by removing foul air but also by heating and air conditioning.
Barca Salom, Francesc X. "The art of ventilation in Barcelona in the second half of the XIX century.". 2013.