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8.0 System Ventilation <br /> 8.3 VENTILATION PLACEMENT: In a GSF system, the vent is usually a 4-inch diameter pipe extended <br /> to a convenient location behind shrubs, as shown in the figure below. Corrugated pipe may be used. If <br /> using corrugated pipe, ensure that the pipe does not have any bends that will allow condensation to pond <br /> in the pipe. This may close off the vent line. The pipe must have an invert higher than the system so that <br /> it does not drain effluent. <br /> FIGURE 18: GSF WITH 4" VENT EXTENDED TO CONVENIENT LOCATION <br /> SHRUB <br /> MOUNDED BACKFILL OVER MODULES <br /> CLEAN BACKFILL <br /> GSF MODULES <br /> COVER FABRIC NOT SHOWN OVER DISTRIBUTION PIPE AND MODULES <br /> 2022 California Design&Installation Manual Page 23 www.eljen.com <br />