Burnham SCG 1100-H4 - Manual (Page 31)

1
8. Straight Sections Cut To Length:
If a custom length of SC is necessary, a standard vent
section can be cut.
a. Measure the distance of the length needed, taking the
measurement from the end of one of the outer jackets
to the beginning of the other outer jacket on the
section to connect to, (A to B on diagram).
b. Select a section that is longer than the required
length.
c. It will be necessary to disassemble the vent prior to
cutting.
Stand the section on end with the holes up. Find the
end of snap ring and pry it out of its groove, being
careful not to damage the ends of the vent pipes.
Pull up on end of the snap ring and pull it out from
the end of the pipe. It may want to spiral out as it is
removed. After the snap ring is removed, the inner
vent pipe can be separated from the outer jacket.
d. Add 2” to the distance measured previously for the
cut length of the outer jacket. Mark a cut line on the
outer jacket on the male end (the end without holes in
it).
An effective way of marking is to run a length of tape
around the section, assuring a square cut.
e. Add 3” to the distance measured previously for the
cut length of the inner vent pipe. Mark a cut line on
the inner vent on the male end (the end without the
red seal).
The inner pipe is always cut 1” longer than the
outer pipe.
f. WEAR GLOVES, as cut ends are very sharp. Cut
the pipes with an abrasive cutoff saw, plasma cutter,
or compound snips. If using snips, start the cut at
the male end and follow a spiral path around the pipe
until the cutoff mark is reached. File off any burrs
or rough edges that develop in the cutting process
and clean off any dust or grit. If the cutting process
distorts the roundness of the pipes, carefully use your
thumbs to re-round the ends.
g. Reassemble the inner vent into the outer jacket and
reinstall the snap ring into the groove. Push the
inner vent into the outer jacket until the triangle on
the inner vent is seated firmly against the bead on
outer jacket. Start one end of the snap ring into the
groove of the outer pipe. Slowly turn and feet the
snap ring into the groove in a spiral motion, and
continue around the pipe until the snap ring is fully
inserted. Ensure that the triangle on the inner vent is
all the way down against the bead of the outer jacket
by pushing in firmly. Also ensure that the snap ring
is completely in the groove all the way around outer
jacket.