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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 single offset/
return
Double offset/return minimum height
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
NOTICE: A maximum of two pairs of offsets and returns
may be used.
6 ft (1.83 m) max.
unsupported run
20 ft (6.10 m) max.
pipe between an
offset & return
Ceiling Firestop
68-1/8 in.
(1730 mm)
Effective Height
Gas
(bottom of fireplace
Knockout
to top of starter collar)
Figure 4.1
Chimney Requirements
VCG Biltmore Series • SB100 • 4013-303 Installers Manual • Rev A • 02/19/15
20 ft
6.1 m
20.5 ft
6.25 m
24 ft
7.32 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
6 ft (1.83 m) max.
unsupported chimney
above roof
35 ft (10.67 m)
max. straight
unsupported
chimney height
20.5 ft (6.25 m) min. height/single offset-return
24 ft. (7.32 m) min. height/double offset-return
90 ft (27.43 m) max. height
WARNING! Risk of Fire! You must maintain 2 in.
(51 mm) air space clearance to insulation and
other combustible materials around the chimney
system. Failure to do so may cause overheating
and fire.
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
17
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