34
pipe square. De-burr the cut edge of the
plastic pipe with a le, razor blade or ne
sandpaper.
vi. Reinstall the inner pipe.
e. To join Concentric Vent Pipe refer to Figure 21
“Joining Cuttable Pipe” and Figure 22 “Joining
Non-Cuttable Pipe” and follow the procedure
below:
i. Start assembly of the vent system at the
boiler. Lubricate the brown gasket in the
boiler vent collar with a few drops of water.
ii. Push the male end of the rst tting into the
boiler collar until it bottoms out. The male
end of cuttable sections should go 1” into
the collar until the insertion mark (made in
Step 4 above) is covered. On other ttings,
the bead on the male pipe will be bottom out
on the collar (see Figure 22).
iii. The male end of cuttable ttings must be
held to the collar with three (3) #10 x 1/2”
sheet metal screws. Drill a 1/8 hole through
both outer pipes to start this screw. Use a
drill stop or other means to ensure that
the drill bit does not penetrate more than
3/8” into the outer pipe. Do not use a
sheet metal screw longer than 1/2” (see
Figure 21).
iv. Use locking bands (provided with all
ttings) to secure non-cuttable pipe, as well
as ttings, to the boiler collar (see Figure
22).
IV. Venting E. Concentric Polypropylene Venting (continued)
Figure 20: Cutting Straight Pipe
Figure 21: Joining Cuttable Pipe
Figure 22: Joining Non-Cuttable Pipe
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