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10
1
/
"
2
MIN
Maintain 3/4"
air space between
framing and
fireplace.
4"
24
3
/
"
4
Figure 3
FRAMING DIMENSIONS AT 30°
ASSEMBLING AND INSTALLING YOUR
DOUBLEWALL CHIMNEY SYSTEM
Each double wall chimney section consists of an outer pipe, flue pipe
and one wire spacer. The pipe sections are not galvanized and must
be assembled independently as the chimney is installed. When
starting the chimney directly on the firebox, the flue pipe section
must be installed first, with the flared end with lances up. The outer
pipe section can then be installed over the flue pipe section with the
hemmed end up (see Figure 4).
Press down on each pipe section until the lances on the lower end
securely engage the knurl on the firebox collar. The wire spacer will
assure the proper spacing between the inner and outer pipe sections.
WARNING: THE OPENINGS IN THE COLLAR AROUND
THE BASE OF THE CHIMNEY AT THE TOP OF THE
FIREBOX MUST NOT BE OBSTRUCTED, NEVER USE
BLOWN INSULATION TO FILL THE CHIMNEY EN-
CLOSURE (SEE FIGURE 5).
Continue to assemble chimney sections as outlined above, making
sure both inner and outer pipe sections are locked together. When
installing double wall "snap lock" chimney together, it is important
to assure the joint between the chimney sections are locked. Check
by pulling chimney upward after locking. The chimney will not
come apart if properly locked. It is not necessary to add screws to
keep the chimney together.
LINEAL GAIN: THE ACTUAL
MEASURABLE LENGTH OF A
PART AFTER TWO OR MORE
PARTS ARE CONNECTED.
12
3
/
GALVANIZED
8
OUTER PIPE
HEMMED
END
8 IN.
STAINLESS
INNER PIPE
Figure 4
55504
14
/
"
5
16
MIN
LINEAL GAIN
PART
NO.
DESCRIPTION
V36EC2
FIREBOX
V12-8DM
PIPE SECTION
V18-8DM
PIPE SECTION
V24-8DM
PIPE SECTION
V36-8DM
PIPE SECTION
V48-8DM
PIPE SECTION
VRTL-8DM
ROUND
VRTTL-8DM TERMINATION
VADS-8DM
VETL-8DM
VETO-8DM
CHASE
VETLO-8DM TERMINATION 1 to 12
VET-8DM
FIREPLACE
COLLAR
Figure 5
Figure 6
FIRESTOP SPACERS - VFS-8DM
Firestop spacers are required at each point where the chimney
penetrates a floor or ceiling joist space. Their purpose is two fold;
they establish and maintain the required clearance between the
chimney and combustible materials.
They also provide complete separation from one floor space to
another floor or attic space as required by most codes.
When the double wall pipe passes though a framed opening into an
attic space, the firestop must be placed into the attic floor as in Figure
6. When the pipe passes through a framed opening into a living space
above, the firestop must be placed onto the ceiling from below as in
Figure 7.
SUPPORT SECTIONS
The chimney support section is a 12-inch length double wall pipe
with 4 straps. A chimney support is required every 30 feet above the
GAIN
firebox after a straight chimney run, or above a return elbow after a
(IN)
straight chimney run (see Figure 8). This support is designed to
42
relieve the extra weight load on the firebox and elbows when high
10
5
/
8
chimneys are installed.
5
16
/
8
5
23
/
8
5
34
/
8
5
46
/
V12S-8DM
8
SUPPORT
6
Figure 8
3
KEEP THIS
AREA OPEN
Figure 7
V12S-8DM
SUPPORT
30 FT.
30 FT.
RETURN
ELBOW
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