Install Instructions

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IV. Venting C. Polypropylene Venting (continued)
Figure 16: Flexible Vent in Masonry Chimney
with Separate Air Intake
19) Lubricate PVC to PP adapter outer seal with water
(or approved water based lubricant), than, insert and
push lubricated adapter end into CPVC coupling
open end until bottomed out.
20) If using polypropylene pipe for combustion air
intake, repeat the above step installing the adapter
into PVC air intake.
21) Install the adapter connector (applicable to M&G/
DuraVent vent system only) to secure PVC to PP
adapter to a coupling and a polypropylene rigid
pipe, either venting and/or air intake.
Table 11 provides polypropylene venting or combustion
air supply system component equivalent length values to
calculate the equivalent vent length.
Venting of Other Appliances (or Fireplace)
into Chase or Adjacent Flues Prohibited!
Optional Two-pipe Vertical Venting Installation –
Running Flexible Polypropylene Vent (Liner)
Thru Unused Chimney Chase (see Figure 16).
Alpine boilers are approved for vertical venting by
installing Flexible Vent in an UNUSED masonry
chimney/chase and supplying combustion air thru a
separate wall or roof air intake terminal.