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VenTing inSTallaTion
Continued
Secure to Collars with
Duct Tape or Screws
Vented Crawl Space
(Check Local Codes
Before Installing in a
Vented Crawl Space)
Figure 13 - Outside Air Kit Installation
CHIMNEY PIPE
The DESA chimney is a snap-lock, double-
wall pipe. It consists of a stainless steel inner
flue pipe(s), a galvanized outer pipe and a
wire spacer.
Each section of pipe comes in lengths of 12",
18" 36" and 48". The actual lineal gain for
each is measured after each section is fully
connected. Lineal gain is the actual measur-
able length of a part after two or more parts
are connected.
LINEAL GAIN
PART NO.
DESCRIPTION
See-Through
V3612ST
48-12DM
48-12TM
36-12DM
48-12TM
24-12DM
48-12TM
18-12DM
48-12TM
12-12DM
48-12TM
Chase Style
STL-12D
Termination
Round Top
RTL-12D
Termination
115603-01C
Air Inlet
Location
Must Allow
For Bushes
or Snow
Air Inlet
Termination
Vent Hood
Required for
Wall Installation
GAIN
52
Fireplace
Flue Pipe
46
Flue Pipe
34
Flue Pipe
22
Flue Pipe
16
Flue Pipe
10
1" to 12"
www.desatech.com
PIPE INSTALLATION
The pipe sections must be assembled inde-
pendently 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 to-
gether. 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 lock-
ing. The chimney will not come apart if prop-
erly locked. It is not necessary to add screws
to keep the chimney together (exception, see
Figure 17, page 8).
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.
15" Galvanized
Outer Pipe
12 3/8"
Stainless
Inner Pipe
Figure 14 - Pipe Connection
/
"
3
4
USING ELBOW OFFSETS AND
SUPPORTS
/
"
5
8
Chimney weight above offset rests on return
elbow. Straps must be securely nailed to raf-
/
"
5
8
ters or joists (see Figure 15, page 8).
To achieve desired offset, you may install
/
"
5
8
combinations of 12", 18", 36" and 48" length
of double wall pipe (see offset chart and
/
"
5
Figure 16, page 8).
8
The chimney support section is a 4" strap
/
"
5
and 12" length of pipe. A chimney support is
8
required every 30 feet above fireplace after a
straight chimney run or above a return elbow
after a straight chimney run (see Figure 17,
page 8). This support is designed to relieve
7"
the extra weight load on fireplace and elbows
when high chimneys are installed.
Hemmed
End
7
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