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109034-01G 7
Figure 8 - Lineal Gain
LINEAL GAIN
PART NO. DESCRIPTION GAIN
36" Fireplace 37
1
/
2
"
12-8DM
12-8HT
Pipe Section 10
5
/
8
"
18-8DM
18-8HT
Pipe Section 16
5
/
8
"
24-8DM
24-8HT
Pipe Section 23
5
/
8
"
36-8DM
36-8HT
Pipe Section 34
5
/
8
"
48-8DM
48-8HT
Pipe Section 46
5
/
8
"
RT-8DM
RT-8HT
Round Termination 6
7
/
8
"*
RTL-8DM
RTL-8HT
Round Termination 7
3
/
4
"*
RTT-8DM
RTT-8HT
Round Termination
with Slip Section
6
7
/
8
" to
23
1
/
8
"*
RTTL-8DM
RTTL-8HT
Round Termination
with Slip Section
8
1
/
2
" to
21
1
/
2
"*
ET-8DM
ET-8HT
Square Chase-Top 12"*
ETO-8DM
Square Chase-Top
with Mesh
12"*
ETL-8DM
ETL-8HT
Square Chase-Top
with Slip Section
7" to 15"*
ETLO-8DM
Square Chase-Top
with Mesh & Slip
Section
12" to
25
1
/
2
"*
* The lineal gain for the terminations is mea-
sured to the ue gas outlet height.
Hemmed
End
8" Stainless
Inner Pipe
12
3
/
8
"
Galvanized
Outer Pipe
Figure 7 - 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)
VENTING INSTALLATION
Installation of outside air kit should be per-
formed during rough framing of replace 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.
inlet ducts shall not terminate
in attic space.
termination.
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 tting
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.
collar around chimney at top of
chimney enclosure.