Assertion: flue | /r/AtLocation | negative pressure
Facets:
Source sentences:
text: For vertical applications: Since hot flue gas naturally rises, it is possible for the flue pipe to be under negative pressure even if the gas-fired appliance has a power venter forcing the flue gas into the vent pipe.
text: In those cases, it would be possible for the flue pipe to be under negative pressure relative to the space pressure and would be Category I. Contact the appliance manufacturer to see if booster fans are allowed for use with their products.