Drafts are produced by produced the rising of the combustion gases in the stack, or by mechanical means, for example a blower and can be put into four categories: natural, induced, balanced, and forced.
Drafts are produced by produced the rising of the combustion gases in the stack, or by mechanical means, for example a blower. This was induced. Drafts can be put into four categories: natural balanced. This was induced. Drafts forced. This was induced.