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❑ Step 10: In nearly all cases, the Fuji Clean treatment system will vent properly through the building's <br />septic influent line. In cases where there is an influent pump, or in severe downdraft locations, a <br />separate vent should be considered. If you do choose to install a vent, be sure that the vent slopes <br />toward the tank so that any moisture accumulation drips back down toward the tank. <br />If optional air vent line is installed, <br />slope conduit toward tank to <br />prevent moisture accumulation <br />3" port for optional air vent line. If not used, <br />install plug in port by turning clockwise to tighten. <br />(Note: 2 ports in CE21, 30, CEN14 and 21). <br />Vent pipe diameter <br />Commercial 3" ((�75) 4" ( 100) <br />One vent line is able to connect system clusters of <br />2 to 4 units with 4" diameter pipe. <br />Joining point of tank and vent line within 16feet. <br />In case of over 5 units, use two (2) vent lines. <br />❑ Step 11: Backfill up to slab <br />base. Compact tightly. Kee <br />backfill material damp to <br />assure compact backfill ani <br />reduce settling risk. <br />Note: Bearing power of so <br />under slab should be 4.4PS <br />or more. <br />:7 <br />• Local regulations may specify required vent pipe <br />diameter. <br />• Keep horizontal vent pipe as short as possible. <br />Vertical pipe length should be 2 times longer than <br />horizontal. <br />• Installation of a positive flow ventilation fan <br />facilitates better ventilation. <br />• Greater temperature differential between tank and <br />outside air facilitates more effective ventilation. <br />20 <br />