www.desatech.com
117541-01B
8
Figure 6 - Lineal Gain
LINEAL GAIN
PART NO.
DESCRIPTION
GAIN
Georgian
Fireplace
66
1
/
"
12-12DM
12-12HT
Pipe Section
10
5
/
8
"
18-12DM
18-12HT
Pipe Section
16
5
/
8
"
24-12DM
24-12HT
Pipe Section
3
5
/
8
"
36-12DM
36-12HT
Pipe Section
34
5
/
8
"
48-12DM
48-12HT
Pipe Section
46
5
/
8
"
RLT-12D
RLT-12HT
Round Termination
7
3
/
4
"*
STL-12D
Square Chase-Top
with Slip Section
7" to 15"*
* The lineal gain for the terminations is mea
-
sured to the flue gas outlet height.
Hemmed
End
1
3
/
8
"
Stainless
Inner Pipe
1" Galvanized
Outer Pipe
ASSEMBLY AND INSTALLATION OF
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 as
-
sembled 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 5 the flue pipe section with the
hemmed end up. Press down on each pipe section
until the lances securely engage the hem on the fire
-
place 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 install
-
ing 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 Figure 9, page 10).
Venting inStallatiOn
OPTIONAL OUTSIDE AIR KIT
(MODEL AK4/AK4F)
The installation of an outside air kit should be per
-
formed during the rough framing of the fireplace
due to the nature of it's location. Outside combus
-
tion air is accessed through a vented crawl space
(AK4F) or through a sidewall (AK4).
CAUTION: Combustion air
inlet ducts shall not terminate
in attic space.
Figure 5 - Outside Air Kit
Secure to Collars with Metal Tape,
Screws or Straps (Min. of 1/4" x 20"
in size)
Air Inlet
Location
Must Allow
For Bushes
or Snow
Vent Hood
Required for
Wall Installation
Air Inlet
Eyebrow
Vented Crawl Space
(Check Local Codes
Before Installing in a
Vented Crawl Space)
CHIMNEY PIPE
The DESA chimney system consists of 12", 18",
24", 36" and 48" 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 6). Lineal Gain is the
actual measurable length of a part after two or more
parts are connected. For Canada, use chimney parts
designated "HT".
WARNING: The opening in the
collar around the chimney at the
top of the fireplace must not be
obstructed. Never use blown insula-
tion to fill the chimney enclosure.
