Never use a natural gas oven or range to heat a room. Use only approved vents for natural gas equipment. Automatic flue dampers must be installed by professionals only. Hand-operated flue dampers should never be used on any natural gas heating installation. Wood stoves may not share vents with natural gas equipment.
Shared vents are dangerous.
Those that are approved may be used as long as no other natural gas appliance shares the same vent or chimney. Make sure that combustible products and materials are stored and used away from heating equipment. Make sure natural gas heating equipment has sufficient fresh air to ensure complete combustion.