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NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
18
Figure 25
Figure 26
OFFSET CHIMNEY INSTALLATION
For the minimum chimney height when using
elbows, see Table 3 and refer to Figure 27.
Note: Use of ACBI chimney with these fireplaces
require the use of a starter section used at the
fireplace top collar. Use H3806 (ACBI7SB30)
offset starter for offset installations.
2. Install the necessary chimney lengths to
achieve the required offset. Lock the chimney
length together. It is recommended to use three
(3) metal screws. If penetrating a wall, use a
wall radiation shield.
3. Use another elbow to turn the chimney verti-
cally. ACBI: Lock it to the chimney. Fasten the
straps attached to the elbow to the surrounding
framing using nails or drywall screws. ASHT+
and S2100+: Fasten it to the chimney with
three (3) 1/2" metal screws, provided with the
elbows.
4. Use a plumb-bob to line up the center of the
hole. Cut a hole for the chimney in the ceiling.
Frame this hole as described previously.
5. From below, install a firestop (refer to Figure
27). ASHT+ and S2100+: A support must be
used after the offset.
6. Continue with the regular installation.
Figure 27
FLASHING
COLLAR
CHIMNEY
Starter
Section
Straps
Support
ACBI7RS
Straps
Chimney ACBI
UNIVERSAL SUPPORT
(AC10SU)
After reaching the location requiring the elbow,
proceed as follows:
1. Install the first elbow. Turn it in the required
direction. ACBI: To lock it in place, turn 1/8
of a turn. Fasten the straps attached to the
elbow to the surrounding frame, using nails or
drywall screws. ASHT+ and S2100+: Fasten it to
the chimney with three (3) 1/2" metal screws,
provided with the elbow.
Roof Down Slope Hole Size
Degree Of
Slope
ACBI
7"
ASHT+
7"
S2100+
7"
0 *
15"
(380mm)
13-3/8"
(340mm)
15-1/8"
(384mm)
2/12 15-5/8"
(390mm)
13-5/8"
(345mm)
15-3/8"
(390mm)
4/12 16-1/8"
(410mm)
14-1/8"
(359mm)
16"
(406mm)
6/12 15"
(380mm)
15"
(380mm)
17"
(432mm)
8/12 18-1/4"
(465mm)
16-1/8"
(410mm)
18-1/4"
(465mm)
10/12 19-5/8"
(499mm)
17-1/2"
(445mm)
19-3/4"
(502mm)
12/12 21-3/8"
(545mm)
19"
(483mm)
21-3/8"
(545mm)
Table 2
*Cross slope Hole size
Minimum Chimney Height
When Using Elbows
Vertical installation 12 feet (3.66 m)
Two (2) elbows 15 feet (4.57 m)
Four (4) elbows 17 feet (5.18 m)
Table 3
Note: This illustration is not to
scale. It represents how the
chimney must be supported.
A 30 degree offset only is
allowed in the USA and a 45
degree maximum offset is
allowed in Canada.