7612 - INSTALLATION - CATEGORY IV: Vent and combustion air12.8 - Polypropylenevent piping materialsWARNING!!!WARNING!!! Use onlythe materials listed in Figures12-7 and 12-8 for vent pipe,and fittings. DO NOT mix ventsystems of different types ormanufacturers, unless listed inthis manual. Failure to complycould result in severe personalinjury, death, or substantialproperty damage.WARNING!!!WARNING!!! This appliancerequires a special ventingsystem. The field provided ventfittings must be connected to theheater following Section 12.8.2.Failure to follow this warningcould result in fire, personalinjury, or death.WARNING!!!WARNING!!! Do notinsulate polypropyleneexhaust pipe nor install intoan enclosure, closet, alcove orany other obstruction therebypreventing the cooling of theexhaust pipe. Failure to followthis warning could result inexcessive levels of carbonmonoxide or a fire, which canresult in severe personal injuryor death!WARNING!!!WARNING!!! Improperinstallation of Polypropylenesystems may result in injury ordeath.WARNING!!!WARNING!!! Use onlywater-based lubricants on joints.Never use hydrocarbons-basedlubricants because they woulddestroy gaskets. Failure tofollow this warning could resultin excessive levels of carbonmonoxide, which can resultin severe personal injury ordeath!NOTICE! Installation must complywith local requirements and with theNational Fuel Gas Code, ANSI Z223.1for U.S. installations or CSA B149.1 forCanadian installations.For installation in Canada, vent pipesystem must be certified to ULC-S636(see Figure 12-7).NOTICE! All vent pipes connectionsmust be secured following manufacturerinstruction, properly supported, and theexhaust must be pitched a minimum ofa 1/4 inch per foot back to the heater (toallow drainage of condensate).NOTICE! Installation of aPolypropylene vent system shouldadhere to the polypropylene ventmanufacturer’s installation instructionssupplied with the vent system.
