Part 7/14:
In the early 1800s, Daniel Perietburn designed a gravity-based warm air system, where heated air from underground furnaces would circulate naturally through ducts. Similarly, William Stratrat in the UK created the hot blast system, using brick-lined fire chambers that pushed heated air through pipes to maintain warmth in large facilities like hospitals.
By the mid-1800s, the idea that a single heat source could supply multiple rooms gained traction. The first effective central heating systems began to appear in American institutions such as Massachusetts Medical School, utilizing hot air through a network of ducts and pipes.