Assertion: category iv furnace | /r/HasProperty | forced-draft
Facets:
value: like category iii furnaces
type: OTHER
Source sentences:
text: Like Category III furnaces, Category IV furnaces are forced-draft, meaning they are equipped with a fan to pull air through the combustion chamber and push the byproducts of combustion out of the furnace through a vent pipe; the vent pipe is sealed so they cannot be back drafted (Figure 5).