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4
Chimney and Termination Requirements
A. Chimney Requirements
Vertical distances are measured from the base of the
fireplace as shown in Figure 4.1.
Table 4.1 Chimney Requirements
• Minimum overall straight height
• Minimum height with offset/return
• Maximum height
• Maximum chimney length between an offset
and return
• Maximum distance between chimney
stabilizers
• Maximum unsupported chimney length
between the offset and return
• Maximum unsupported chimney height above
the fireplace
• Maximum unsupported chimney above roof
• Minimum height with double offset/return
NOTICE:
A maximum of two pairs of offsets and returns
may be used.
WARNING! Risk of Fire!
mm) air space clearance to insulation and other com-
bustible materials around the chimney system. Fail-
ure to do so may cause overheating and fire.
20 ft (6.10 m) max.
pipe between an
offset & return
Ceiling firestop
74 1/8 in.
(1884 mm)
Effective
Height
Figure 4.1
Chimney Requirements
16
18 ft
(5.5 m)
18.5 ft
(5.64 m)
90 ft
(27.43 m)
20 ft
(6.1 m)
35 ft
(10.67 m)
6 ft
(1.83 m)
35 ft
(10.67 m)
6 ft
(1.83 m)
22.5 ft
(6.86 m)
You must maintain 2 in. (51
6 ft (1.83 m) max.
unsupported chimney
above roof
35 ft (10.7 m)
max. straight
unsupported
chimney height
18.5 ft (5.64 m)
min. height
single offset-return
90 ft (27.4 m)
max. height
Majestic • Ashland ASH36 Installation Manual • 4059-909 • Rev D • 04/19
NOTICE:
You must provide support for the pipe during
construction and check to be sure inadvertent loading has
not dislodged the chimney section from the fireplace or at
any chimney joint.
Table 4.2 Chimney Component Dimensions
HEIGHT OF CHIMNEY COMPONENTS
Chimney Stabilizer
SL11
Offsets/Returns
SL1130
Chimney Sections*
SL1106
SL1112
SL1118
SL1136
SL1148
* Dimensions reflect effective height.
in.
mm
4-3/4
121
18
457
4-3/4
121
10-3/4
273
16-3/4
425
34-3/4
883
46-3/4
1187
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