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Section MC 808: Reduction of Flue Size
808.1 Reduction of flue size.
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807.1 Changes in appliance fuels.
Conversion of appliances from solid or liquid fuel to, or the addition of, natural gas shall be installed per the New York City Fuel Gas Code. Conversion from natural gas to, or the addition of, #2 fuel oil for a heating appliance shall be made only if:
   1.   The chimney design meets the requirements of this chapter for the conversion fuel, and the chimney is test run and smoke tested in accordance with Section 810.
   2.   The chimney is sized to provide adequate draft and vent the combustion products for the new fuel.
   3.   The chimney is thoroughly cleaned prior to the conversion to remove collected flue deposits.
Section MC 808: Reduction of Flue Size
808.1 Reduction of flue size.
Conversion from one fuel to another or the use of an existing chimney to service a fireplace or wood-burning appliance may require a flue size change for proper operation. This may be done if the redesigned flue meets the criteria for the fuel and chimney type to be used as set forth in this chapter.

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