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OPTIONAL OUTSIDE AIR KIT
(MODEL AK4/AK4F)
Installation of an outside air kit should be
performed during rough framing of fireplace
due to the nature of it's location. Outside com-
bustion air is accessed through a vented crawl
space (AK4F) or through a sidewall (AK4).
See Figure 26 on page 14 for instruction of
operating air kit.
CAUTION: Combustion air
inlet ducts shall not terminate
in attic space.
The maximum height for the
air vent can not exceed 3 feet
below the flue gas outlet of the
termination.
Secure to Collars with Metal Tape, Screws
or Straps (Min. 1/4" x 20" size)
Vented Crawl Space
(Check Local Codes
Before Installing in a
Vented Crawl Space)
Figure 5 - Outside Air Kit
CHIMNEY PIPE
The DESA Heating, LLC 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 consider-
ation (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".
6
VenTing insTallaTion
Air Inlet
Location
Must Allow
For Bushes
or Snow
Air Inlet
Eyebrow
Vent Hood
Required for
Wall Installation
www.desatech.com
WARNING: The opening in
collar around chimney at top of
fireplace must not be obstructed.
Never use blown insulation to fill
chimney enclosure.
LINEAL GAIN
PART NO.
DESCRIPTION
Georgian
12-12DM
Pipe Section
12-12HT
18-12DM
Pipe Section
18-12HT
24-12DM
Pipe Section
24-12HT
36-12DM
Pipe Section
36-12HT
48-12DM
Pipe Section
48-12HT
RLT-12D
Round Termination
RLT-12HT
Square Chase-Top
STL-12D
with Slip Section
* The lineal gain for the terminations is mea-
sured to the flue gas outlet height.
15" Galvanized
Outer Pipe
12
/
"
3
8
Stainless
Inner Pipe
Figure 6 - Lineal Gain
ASSEMBLY AND INSTALLATION OF
DOUBLE WALL CHIMNEY SYSTEM
Each double wall chimney section consists of
a galvanized outer pipe, a stainless steel in-
ner flue pipe and a wire spacer. Pipe sections
must be assembled independently as chim-
ney is installed. When connecting chimney
directly to fireplace, inner flue pipe section
must be installed first with lanced side up.
The outer pipe section can then be installed
over flue pipe section with hemmed end up.
Press down on each pipe section until lances
securely engage hem on fireplace starter. The
wire will assure proper spacing between inner
and outer pipe sections.
GAIN
Fireplace
66
10
16
23
34
46
7
7" to 15"*
Hemmed
End
116010-01E
/
"
1
2
/
"
5
8
/
"
5
8
/
"
5
8
/
"
5
8
/
"
5
8
" *
/
3
4
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