- 6 -
For more information, visit www.desatech.com
OPTIONAL OUTSIDE AIR KIT (MODEL AK4 / AK4F)
The installation of an outside air kit should be performed
during the rough framing of the fireplace due to the nature of
its location. Outside combustion air is accessed through a
vented crawl space (AK4F) or through a sidewall (AK4). See
page 10, fig. 22 for instructions on how to operate the air kit.
CHIMNEY PIPE
The DESA 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
lengths gained after fitting overlaps must be taken into
consideration (lineal gain) and are given in the lineal gain
chart (see figure 5).
For Canada, use chimney parts designated “HT”
ASSEMBLY AND INSTALLATION OF THE 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 independently as the
chimney is installed. When connecting 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.
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.
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 6 figure 8).
INSTRUCTIONS WHEN ELBOW OFFSET (30E-12DM)
OF CHIMNEY IS NEEDED
1.
To achieve desired offset, you may install combinations
of 12”, 18”, 24”, 36” and 48” length of double wall pipe
(see single offset chart and figure 6).
2.
Chimney weight above offset rests on return elbow.
Straps must be securely nailed to rafters or joists (see
figure 7, details a & b).
3.
Maximum length of pipe between supports (return elbow
or 12S-12DM) is 6’ of angle run. Maximum of two (2) 6’
angle run sections per chimney system (see figure 6).
OFFSET CHART (22-50 FT. SYSTEM HEIGHT)
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.
Figure 4 OUTSIDE AIR KIT
OFFSET
RISE
A
B
48"
36"
24"
18"
12"
4 - 3/8
16 -3/8
9 - 3/4
25 - 1/2
1
12 - 3/4
30 - 3/4
1
15
34 - 3/4
1
18
40
1
1
21 - 1/4
46 - 1/4
1
23 - 3/4
49 - 1/4
1
1
27 - 3/4
56 - 3/4
1
30
60 - 3/4
1
1
33
66 1
1
36
71
1
1
38 - 1/4
75
2
41 - 1/4
80 - 1/4
1
1
1
45
86 - 3/4
2
46 - 3/4
89 - 1/2
1
1
1
51
97
1
1
53 - 1/4
101
2
1
56 - 1/4
106 - 1/4
2
59 - 1/4
111 - 1/2
1
1
1
61 - 3/4
115 - 1/2
2
1
64 - 3/4
120 - 3/4
2
1
68 - 1/4
127
1
2
70
130
2
1
1
74 - 1/4
137 - 1/2
1
2
1
76 - 3/4
141 - 1/2
1
2
1
79 - 3/4
146 - 3/4
4
ELBOW SET ONLY
CHIMNEY LENGTH
CAUTION
: Combustion air inlet ducts shall not terminate
in attic space.
Figure 5 LINEAL GAIN
