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" ... The idea that miasmas helped spread disease was common during the Civil War era. Most surgeons understood the importance of fresh air, ventilation and “space” for each patient. Hospital procedures often cited the amount of cubic air space to be allocated for each patient (the optimal being 1,000 cubic feet of air space per person). In purpose-built hospital wards, ridge ventilation was important, and it provided the best air flow when combined with the windows. Ventilation shafts were used in colder months. ... "