Burnham FCM120 - Manual (Page 23)

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6) Use locking bands provided to join adjacent sections of 39” pipe as well as fi ttings. The terminal section and the male
end of the 19 1/2” section must be held to the adjoining pipe with at least one #10 x 1/2” sheet metal screw. 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 penetrate
more than 3/8” into the outer pipe. Do not use a sheet metal screw longer than 1/2”.
7) The only straight pipe that can be cut is the terminal section and the 19-1/2” section (P/N 100995-01). To cut this pipe:
a) Cut the 19 1/2” section from the male end. After marking the desired length of the outer pipe, remove the plastic inner
pipe by pulling it out from the female end.
b) Cut the outer pipe only at the point marked in Step (b) 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 emory cloth.
c) Cut the plastic inner pipe so that it will protrude 3/8” beyond the outer pipe when 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.
d) Reinstall the inner pipe.
8) Install the terminal as outlined in Step (4) above. Dimension “L” described in Step 4 is the distance from the exterior
surface of the wall to the end of the last piece of pipe inside the building.
Figure 7.12: Cutting Outer Pipe
Figure 7.13: Cutting Inner Pipe