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14~ SECTION 2 - 22 CHIMNEY LINERS: Except as exempted in this section, and except on approved incinerators as designated in Article IV (4) of this ordinance, masonry chimneys serving gas fired boilers, furnaces, or heating devices, whether of the gas designed type or fired by gas conversion burners shall be ltned continuously from the thimble to the top with an approved incombustible, acid and corrosion resisting liner of the same equivalent internal cross-sectional area-as the flue pipe or pipes extending from the appliance or other appliances to the chimney liner. A condensation pocket shall be provided at the base of said liner with provisions for a drip, so arranged that excessive condensation of flue products may be disposed of without damage to chimney, foundation, floor or footings. Such liners shall be constructed of material having a thickness before coating of not less than No. 22 U.S.Standard Gauge. Where such liners are constructed of uncoated materials and inherent characteristics of which show a high degree of resistance to 8cids and corrosion, a lighter gauge m~ be used, subject to t.he approval of' the Gas Inspector. In the event theuchimney flue serving t.he conversion fired or gas designed appliance a130 serves one or more heating appliances other than gas fired, the above provided liner may be omitted. On larger installations where burners are in more or less continuous operation, and stack temperatures are sufficiently high to minimize the possibility of condensation within the ch~ey, the chimney liner may be omitted, subject to the approval of the Gas Inspector. SECTION 2 - 23 ADEQUACY OF DRAFT: In the event conditions at the time of installation are such that the chimney or vertical flue has insufficient nat.ural draft to _ properly carry away the products of combustion or is subject to dawn drafts, provision shall be made by the installer to rectify existing conditions or provide mechanical means of main- taining constant updraft during appliance operation. SECTION 2 - 24 ADJUSTMENT OF BURNERS: After the piping has been thoroughly purged, the pilot burner shall be lighted and adjusted and the burners put into operation in accordance with the manu- facturers' instructions. INSPECTION AND TESTS Section 2 - 25 PILOT OPERATION: Pilot flames shall effectively ignite the gas at the main burner or burners and shall be adequ.ately protected from drafts. A device which, under normal chimney draft conditIons is at least equal in performance to the draft hood hereinbefore provided for, shall be interpreted as fulfilling the second part of thie requirement-as far as chimney drafts are concerned. SECTION 2 - 25.1 Pilot flames shall not become extinguished when the main burner or burners are turned on or off In a normal mazmer, either manually or by automatic controls. ~