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. _ I <br /> III. INSTALLATION CONSIDERATIONS <br /> * The catalytic silencer should be located as close to the engine <br /> t <br /> as possible. If a heat recovery unit is to be used, it must be installed <br /> downstream from the catalytic silencer,. <br /> y <br /> * Flexible metal tubing should be used to connect the exhaust gas <br /> piping to the catalytic silencer to minimize forces and moments on the <br /> units. <br /> * A counterbalanced flapper type rain cap is recommended to aid in <br /> preventing the entrance of water .into the exhaust system. s <br /> A manometer should be installed upstream of the catalytic <br /> silencer to monitor back pressure. <br /> * Insulation may be desired for the protection of personnel and to <br /> minimize heat loss from the exhaust pipe. <br /> * A fuel supply shut off valve should be installed to interrupt the <br /> gas supply to the engine should the temperature downstream of the catalytic <br /> silencers exceed the maximum recommended temperature. <br /> * Pipe the exhaust gas from the catalytic silencer to a point where I. <br /> the exhaust gas can discharge harmlessly. <br /> * Oil consumption must be controlled as ash deposits and some oil <br /> additives will diminish activity. <br /> �I <br /> �I <br /> !I <br /> i <br /> L <br /> II <br /> I: <br /> i <br /> C/21 <br />