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8. InstallationsusingPolyPro-ex(VentOptions18,19,33,34):
RefertoDuraVentPolyproexInstructionsforassemblyofallexcomponentsincludingthechimneycapandtheadaptor
to rigid Polypro at the base of the masonry or B vent chimney. In addition, observe the following requirements:
a. RefertotheappropriateVentoptioninTables7.13bor7.21foralistoftheprincipleexcomponentsrequired.Rigid
vent pipe by the same manufacturer will also be required for the run from the boiler to the base of chimney.
b. Masonry chimneys cannot be used for an air chase
c. B vent chimneys can only be used for an air chase (Vent options 18, 19) if the B vent has the minimum size shown in
Table 7.13b and is fully accessible for sealing of all joints and seams.
d. When Vent Option 18 or 19 is used, install a Tee on the base of the B-vent that is the same size as the B- Vent chimney.
Install the PolyPro Lower B–Vent adaptor in the base of this Tee as described in the DuraVent PolyPro Flex instructions.
Connection of the PVC air intake pipe to the side outlet of the tee is made using a cap and a PVC socket x male thread
adaptor (2” or 3”, depending on the Vent Option). Cut a clearance hole in the cap for the male threads. Secure the
adaptor to the cap using a 2” or 3” electrical conduit lock nut. Seal all joints with RTV.
G. Assembly of Selkirk Polyue Vent Systems
1. ThisboilerhasbeenapprovedforusewiththeSelkirkPolyuesinglewallpolypropyleneventsystemtobeprovidedbythe
installer.
2. Assemble the vent system, starting at the boiler:
a. Theventadaptorhastwodifferentinsidediameters.Thesmaller,lower,insidediameteraccepts3”nominalPolyue
(Figure 7.27). A locking ring in the adaptor prevents the vent pipe from coming out of the adaptor once it is inserted.
Lubricatetheuppergasketintheventadaptorwithmildsoapywaterandinserttherstpieceof3”Polyueintothe
adaptor until it bottoms out.
b. If2”Polyueistobeusedfortheventsystem,reducetherstpieceof3”PolyueinstalledinStep(a)to2”using
Selkirk#3PF-3R2.Otherwiseassemblethenextpieceof3”Polyue.
c. For each joint, verify that the gasket is evenly seated in the bell (female) end of the pipe. Lubricate this gasket with mild
soapy water. Slide a Pipe Locking Band over the male end of the pipe to be joined as shown in Figure 7.41. Push the
male end of the next section of pipe into the bell until it bottoms out, then back out 1/8—1/4” to provide room for
thermal expansion. Slide pipe locking band over the female end of the connections and tighten both hose clamps.
d. Assembletherestoftheventsystemperthemanufacturer’sinstallationinstructions,beingsuretopitchhorizontal
sections back towards the boiler 5/8” per ft.
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