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150 linkage or by change in furnace pressure. The operating medium may be steam, electricity, air or hydraulic. If the 'gas contr&l goes to open position upon failure of operating medium, thena means for shutting off the gas supply upon the failure of the operating medium must be provided. SECTION 3-13.3 Where quick opening or slow opening gas control valve is connected to an inlet shutter on gas burner, the air inlet shutter or louvre only must be so designed or counter-balanced as to drop to full open position in the event o,t breakage or failure of connecting mechanism. When the control is of the modulating type that operates the air inl..et shutter or louvre only, shutter or louvre must be so designed and counterbalanced as to drop to full open position upon the failure or breakage of ~onnecting linkage. The uptake or outlet damper must have an indicator or pointer visible to the operator to show the position of the damper in relation tQ open and closed position. Remote indicators are permitted where necessar,y. SECTION 3-14 DRAFT REGULATOR: When uptak.e damper is set in a fixed position such as will be used with "on" or "off" control or the modulating type that operates only the air louvres on the burner, a draft regulator must be used. . This regulator shall be of the type that will reverse and open to the boiler room in the event of down or back drafts. Where control that operates the damper is used, or induced or forced draft fan or both is used, it shall be optional as to the use of a draft regulator. Draft hood or diverter is not permissible. SECTION 3-15 COMBUSTION INSTRUMENTS. All gas burner installations in steam boilers with an input exceeding 2500 ft. of gas per hour shall be equipped with indicating gauges for furnace, windbox and uptake draft to show combustion conditions and with flue gas analysis equipment of portable or fixed type. On installations exceeding 20,000 cu. ft. gas input per hour, equipment shall be installed for continuous indication or recording of carbon dioxide~ oxygen or air flow-steam flow. SECTION 3 - 16 PIPING: All,piping connections for bas burners under this section of the ordinance shall be properly sized for the design maximum load with a total pressure drop permissible under the particular conditions of the application. SECTION 3-17 INSTALLATION DRAWING: On all installations with an input capacity -in excess of 1,000,000 BTU per hour, the contractor shall submit to the Buildings Inspector with his request for a permit a detail drawing made by the burner manufacturer shuwing method of installing burner, recommended furnace construction including floor insulation, control assembly along with piping details, pipe sizes, valve sizes, type and make of control if of the uptake damper operating type. If this is to be furnished by someone other than the burner manufacturer, he must show this as it will be applied to his burner. This drawing must be one that is made up for the specific job and cannot be what is knowl\as a typical installation nor a marked up drawing of some similar installation with changes to suit the job in question. This drawing must have a drawing number as well as a title listing the name of the job to which it applies. It is desirable