Installation manual20DDDDDDCCCCBBDDDDCCCCBBAADDCCCCBBAAACCCCBBAAAACCBBAAAAABBAAAAAAAAAAAAADDDCCCCBBAAADCCCCBBAAAACCCBBAAAAACBBAAAAAABAAAAAAAAAAAAADDCCCCBBAAAACCCCBBAAAAACCBBAAAAAABBAAAAAAAAAAAAAAAAAAATable 7-3: Determination of the permissibility of a concentric system with roof terminalG20/G25/G25.3G30/G31Total number of metres horizontal pipe lengthTotal number of metres vertical and/or sloping pipe lengthNo bends2 bends3 bends4 bends5 bendsSituation is not permissible. There are many more possibilities in combination with the DRU PowerVent® system (DRU PV-I 100/60) (see PowerVent® installation manual). Table 7-4: Conditions for setting the appliance when using a roof terminalG20/G25/G25.3/G30/G31SituationABCDAir inlet guideL1*L1L1L1 + L2Restrictor slideNOR1R1+R2R1+R2* Factory settings: Air inlet guide (L1) mounted and no restrictor slide placed.3The concentric system in combination with a roof terminal (C31) needs to be reduced in diameter to 150/100 mm. See section 7.3.2 for further explanation and placement of the reduction.
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