2
ASSEMBLING AND INSTALLING YOUR DOUBLE
WALL CHIMNEY SYSTEM
Each double wall chimney section consists of a galvanized
outer pipe, a stainless steel inner flue pipe and a wire spacer.
The pipe sections must be assembled as the chimney is
installed. When starting chimney directly to the fireplace, the
inner flue pipe section must be installed first with the lanced
side up. The outer pipe section can then be installed over the
flue pipe section with the hemmed end up (see fig.4).
Press down on each pipe section until the lances securely
engage the hem on the fireplace starter. The wire will assure
the proper spacing between the inner and outer pipe sections.
WARNING: THE OPENING IN THE COLLAR
AROUND THE CHIMNEY AT THE TOP OF THE
FIREPLACE MUST NOT BE OBSTRUCTED. NEVER
USE BLOWN INSULATION TO FILL THE CHIMNEY
ENCLOSURE (SEE FIG. 5).
Continue to assemble chimney sections as outlined above,
making sure that both the 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
is 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
(exception – see page 5 figure 16).
CHIMNEY PIPE:
The FMI chimney system, consists of 12, 18, 24, 36 and 48
inch snap-lock double wall pipe segments, planned for
maximum adaptability to individual site requirements. Actual
length gained after fitting overlaps must be taken into
consideration (lineal gain) are given in the following chart:
Figure 1
FRAMING DIMENSIONS
Figure 2 FRAMING DIMENSIONS
Figure 3
Figure 4
Figure 5
