Astria.US.com
126659-01D
8
Figure 8 - Lineal Gain
Hemmed
End
8" Stainless
Inner Pipe
12
3
/
8
"
Galvanized
Outer Pipe
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
CAT. NO. PART NO.
DESCRIPTION
GAIN
36"
Fireplace
37
1
/
2
"
F0895
F0881
12-8DM
12-8HT
Pipe Section
10
5
/
8
"
F0896
F0882
18-8DM
18-8HT
Pipe Section
16
5
/
8
"
F0897
F0883
24-8DM
24-8HT
Pipe Section
23
5
/
8
"
F0898
F0884
36-8DM
36-8HT
Pipe Section
34
5
/
8
"
F0899
F0885
48-8DM
48-8HT
Pipe Section
46
5
/
8
"
F0916
RT-8DM
Round Termination
6
7
/
8
"*
RTL-8DM
Round Termination
7
3
/
4
"*
F0918
RLT-8DM
Round Termination
7
1
/
2
"*
F0917
RTT-8DM
Round Termination with
Slip Section
6
7
/
8
" to
23
1
/
8
"*
RTTL-8DM
Round Termination with
Slip Section
8
1
/
2
" to
21
1
/
2
"*
F0919
RLTT-8DM
Round Termination with
Slip Section
7
1
/
2
" to
21
1
/
4
"*
F0920
ET-8DM
Square Chase-Top
12"*
F0922
ETO-8DM
Square Chase-Top with
Mesh
12"*
F0921
ETL-8DM
Square Chase-Top with
Slip Section
7" to 15"*
F0923
ETLO-8DM
Square Chase-Top with
Mesh & Slip Section
12" to
25
1
/
2
"*
* The lineal gain for the terminations is measured to the
flue gas outlet height.
VENTING INSTALLATION
Continued
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. Pipe sections
must be assembled independently as chimney is installed. When
connecting chimney directly to fireplace, inner flue pipe section
must be installed first with lanced side up. 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. Wire will assure proper spacing between inner
and outer pipe sections.
Note:
For Canada, use chimney parts designated HT.
Continue to assemble chimney sections as outlined, making sure
that both inner and outer pipe sections are locked together. When
installing double wall snap-lock chimney together, it is important to
assure joint between chimney sections is locked. Check by pulling
chimney upward after locking. Chimney will not come apart if properly
locked. It is not necessary to add screws to keep chimney together
(exception - see Figure 11, page 10).
The height of a vertical chimney pipe supported ONLY by the fireplace,
must not exceed 20 feet. Chimney heights above 20 feet must be
supported.
USING ELBOW OFFSETS (30E-8DM)
1. To achieve desired offset, you may install combinations of 12",
18", 24", 36" and 48" length of double wall pipe (see offset chart,
page 10, and Figure 9, page 9).
Note:
For systems with 2 elbow sets, minimum height is 22 feet.
Maximum height for any system is 50 feet.
2. Chimney weight above offset rests on return elbow. Straps must
be securely nailed to rafters or joists (see Figure 10, details A and
B, page 9).
3. Maximum length of pipe between supports (return elbow or 12S-
8DM) is 6' of angle run. Maximum of two 6' angle run sections
per chimney system (see Figure 9, page 9).
4. All pipe connections between offset and return must be secured
with two screws on outer pipe only (see Figure 11, page 10). Do
not penetrate inner stainless.
