SECTION 7: VENTING13 of 556. After it has been determined that each piece(s)of equipment connected to the venting systemproperly vents when tested as outlined above,return doors, windows, exhaust fans, fireplacedampers and any other gas-burning piece(s) ofequipment to their previous conditions of use.7. If improper venting is observed during any ofthe above tests, the venting system must becorrected by a contractor qualified in theinstallation and service of gas-fired equipmentor your local gas supplier. If the venting must beresized, use appropriate tables in (US)Appendix G of NFPA 54/ANSI Z223.1 - latestrevision, National Fuel Gas Code (US) orStandard CSA B149.1 Natural Gas andPropane Installation Code (Canada) todetermine minimum size. All vent correctionsmust be in accordance with the appropriatelocal codes and the NFPA 54/ANSI Z223.1 -latest revision, National Fuel Gas Code (US) orStandard CSA B149.1 Natural Gas andPropane Installation Code (Canada).Figure 7: Vent and Roof DetailFigure 8: Standard Vented Heater - Vertical and Horizontal Vent TerminationModel Vent Diameter Part NumberUHD[T][M][X][R] 150 - 400 4" (10 cm) 90502102
