Queensland State Archives posted a photo:
Fresh Air For Office-Workers
A sedentary office life means, as a rule, insufficient fresh air during the hours of daylight, slackness of the muscles of the frame and especially the abdomen, and frequently eyestrain caused by close work by poor artificial light.
Fresh, pure air can be assured by proper ventilation and office discipline in the way of keeping windows open. In addition, there is a growing tendency towards the adoption in office and shops of some form of control of ventilation in the way of “conditioned air.”
Air conditioning is objectionable to many, because it means sealing all windows, and removes the possibility of arranging the temperature and especially the humidity of the air to suit the individual taste. Most people like to have the management of the windows under their control. It is true that one would become accustomed to sealed windows, and predetermined air, but