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3) (contd.) To cut the straight sections listed above refer to Figure 7.32 and the following instructions:
Determine the required length of the a) outer pipe. When doing this allow an additional 1” of length for
insertion into the female end of the adjoining pipe. Mark the cut line on the outer pipe.
Remove the plastic inner pipe by pulling it out from the female end. b)
Cut the c) OUTER PIPE ONLY at the point marked in Step (a) using aviation shears, a hacksaw, or an
abrasive wheel cutter. Be careful to cut the pipe square. De burr the cut end with a fi le or emery cloth.
Make an insertion mark 1” from the male end of the outer pipe. d)
Cut the plastic inner pipe so that it will protrude 3/8” beyond the male end of the outer pipe when e)
reinstalled in the outer pipe. Use a fi ne tooth hacksaw or a PVC saw to cut the plastic pipe and be careful
to cut the pipe square. De burr the cut edge of the plastic pipe with a fi le, razor blade, or fi ne sandpaper.
Reinstall the inner pipe.f)
Joining Pipe4) -
Start assembly of the vent system at the boiler. Lubricate the brown gasket in the boiler vent collar with a a)
few drops of water.
Push the male end of the fi rst fi tting into the boiler collar until it bottoms out. The male end of cuttable b)
sections should go 1” into the collar until the insertion mark (made in Step 3d above) is covered. On other
fi ttings, the bead on the male pipe will bottom out on the collar (Figure 7.33b).
The male end of cuttable fi ttings must be held to the collar with three #10 x 1/2” sheet metal screws. Drill c)
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” (Figure 7.33a).
Use locking bands (provided with all fi ttings) to secure non-cuttable pipe, as well as fi ttings, to the boiler d)
collar (Figure 7.33b).
Use the same method to join all remaining vent components except for the terminal. e)
Figure 7.32: Cutting Straight Pipe