OPTIONAL OUTSIDE AIR KIT
(MODEL AK4/AK4F)
Installation of outside air kit should be per-
formed during rough framing of 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).
See Figure 24 on page 15 for instruction of
operating air kit.
CAUTION: Combustion air
inlet ducts shall not terminate
in attic space.
Secure to Collars with Metal Tape, Screws
or Straps (Min. of 1/4" x 20" in size)
Vented Crawl Space
(Check Local Codes
Before Installing in a
Vented Crawl Space)
Figure 7 - Outside Air Kit
CHIMNEY PIPE
DESA Heating, LLC chimney system con-
sists of 12", 18", 24", 36" and 48" snap-lock,
double-wall pipe segments, planned for
maximum adaptability to individual site re-
quirements. Actual lengths gained after fitting
overlaps must be taken into consideration
(lineal gain) and are given in lineal gain chart
(see Figure 8).
Lineal gain is actual measurable length of a
part after two or more parts are connected.
123226-01B
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.
12
/
"
3
8
Galvanized
Outer Pipe
8" Stainless
Inner Pipe
LINEAL GAIN
PART NO.
DESCRIPTION
36"
12-8DM
Pipe Section
12-8HT
18-8DM
Pipe Section
18-8HT
24-8DM
Pipe Section
24-8HT
36-8DM
Pipe Section
36-8HT
48-8DM
Pipe Section
48-8HT
RT-8DM
Round Termination
RT-8HT
RTL-8DM
Round Termination
RTL-8HT
RTT-8DM
Round Termination
RTT-8HT
with Slip Section
RTTL-8DM
Round Termination
RTTL-8HT
with Slip Section
ET-8DM
Square Chase-Top
ET-8HT
Square Chase-Top
ETO-8DM
with Mesh
ETL-8DM
Square Chase-Top
ETL-8HT
with Slip Section
Square Chase-Top
ETLO-8DM
with Mesh & Slip
* The lineal gain for the terminations is mea-
sured to the flue gas outlet height.
Figure 8 - Lineal Gain
Hemmed
End
GAIN
Fireplace
37
10
16
23
34
46
6
7
6
23
8
21
7" to 15"*
12" to
25
Section
/
"
1
2
/
"
5
8
/
"
5
8
/
"
5
8
/
"
5
8
/
"
5
8
/
"*
7
8
/
"*
3
4
/
" to
7
8
/
"*
1
8
/
" to
1
2
/
"*
1
2
12"*
12"*
/
"*
1
2
7