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138;. SECTION 2 - 11.1 The draft hood should ordinarily be located adjacent to the appliance. In cases where it appears desirable to place the draft hood at a distance from the appliance, the size of the restricted section may be modified according to the length and rise of the flue pipe. SECTION 2 - 11.2 The proportioned section at the flue outlet of the appliance eliminates the necessity of using an adjustable damper in the flue pipe and Buch damper will not be permitted. SECTION 2-11.3 Where dampers are an integral part of the boiler or furnace, they shall be removed or permanently secured in the wide open position, except such dampers the function of which is to alter the passage of flue gases through the appliances , which shall be locked in such a position as not to interfere with the norma1 operation of the burners. SECTION 2 - 11.4 Material used for flue pipe shall be such as to resist the corrosive action of flue gases. SECTION 2 - 11.5 Flue pipe of existing ~stems shall be relocated where necessary and new flue pipe installations shall be so made as to avoid sharp turns or other constructional features which would create excessive resistance to the flow of flue gases. Flue pipes shall slope upward to chimney. SECTION 2-11.6 Flue pipe shall be tightly connec.ted to the chimney liner, so as to prevent infiltration of cold air. SECTION 2 - 11.7 No baffles shall be applied which will interfere with the proper cOlJ1bul'ltion of the gas. Section 2 - 11.8 Flue pipe shall be well supported to prevent sagging and shall not be installed closer than six (6) inches t.o any combustible building mater~als ~~less flue pipe is covered with incombustible insulation such that the surface temperature o~ the exterior surface thereof attain 8 temperature not higher than one hundred twenty-five (125) degrees Fahrenheit when the appliance is under continuous operation. SECTION 2 - 11.9 All space heating equipment shall be of the vented type and properly vented to an effective flue.