Assertion: category iv furnace | /r/CapableOf | draw their combustion air
Facets:
value: via a second vent pipe
type: MANNER
value: directly
type: MANNER
Source sentences:
text: They are typically installed as sealed combustion/direct vent appliances, meaning they draw their combustion air directly from outside.
text: Category IV furnaces should be installed as sealed-combustion/direct vent appliances, which means their combustion chamber is sealed off from the CAZ and they draw their combustion air from outside via a second vent pipe that brings combustion air directly to the combustion chamber from outside the home.