www.fmiproducts.com
125183-01B
7
Figure 7 - Lineal Gain
Figure 6 - 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)
WARNING: The opening in
collar around chimney at top of
fireplace must not be obstructed.
Never use blown insulation to fill
chimney enclosure.
Hemmed
End
8" Stainless
Inner Pipe
12
3
/
8
"
Galvanized
Outer Pipe
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
Round Termination
6
7
/
8
"*
RTL-8DM
Round Termination
7
3
/
4
"*
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
"*
ET-8DM
Square Chase-Top
12"*
ETO-8DM
Square Chase-Top
with Mesh
12"*
ETL-8DM
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
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 in
-
ner 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. The wire
will assure proper spacing between inner and
outer pipe sections.
Note: For Canada, use chimney parts desig-
nated HT.
Opening in collar around
chimney at top of fireplace must
not be obstructed. Never use
blown insulation to fill chimney
enclosure.
