Some illustrations from - Lectures on ventilation: being a course delivered in the Franklin Institute, of Philadelphia, during the winter of 1866-67. By Lewis W Leeds, special agent of the Quartermaster-General for the Ventilation of Government Hospitals during the war; and Consulting Engineer of Ventilation and Heating for the US Treasury Department.
The sub-title tells you something about the author's view on the issue: Man's own breath is his greatest enemy.
Published in New York John Wiley & Son 1869.
The full book is available HERE.
