(1)
A chimney flue that serves a fireplace or incinerator shall not serve any other appliance.
(2)
A chimney flue that serves a solid fuel-burning appliance shall not be connected to a natural gas- or propane-fired appliance.
(3)
A chimney flue that serves a solid fuel-burning appliance shall not be connected to an oil-burning appliance unless the solid fuel-burning appliance is listed for such installation and the installation of both appliances meets their respective installation requirements.