25
A. Chimney Requirements
Measure vertical distances from the base of the fireplace
as shown in Figure 8.2.
20 ft (6.10 m) max.
pipe between an
offset & return
Ceiling firestop
35 ft (10.67 m) max. straight
unsupported chimney height
16 ft (4.88 m) min. height (single offset-return)
20 ft. (6.10 m) min. height (double offset-return)
90 ft (27.4 m) max. height
6 ft (1.83 m) max.
unsupported chimney
above roof
47-1/4 in.
(1200 mm)
Effective
Height
Figure 8.2 Chimney Requirements
Table 8.1
ft
meters
• Minimum overall straight height
14
4.27
• Minimum height with offst/return
16.5
5.03
• Maximum height
90
27.43
• Maximum chimney length bewtween an offset
and return
20
6.10
• Maximum distance between chimney stabilizers
35
10.67
• Double offset/return minimum height
20
6.10
• Maximum unsupported chimney length between
the offset and return
6
1.83
• Maximum unsupported chimney height above the
fireplace
35
10.67
• Maximum unsupported chimney above roof
6
1.83
WARNING! Risk of Fire! You must maintain 2 in. (51
mm) air space clearance to insulation and other combus-
tible materials around the chimney system. Failure to do
so may cause overheating and fire.
Determine the chimney components needed to complete
your particular installation:
• Measure the total vertical height of the fireplace
installation from the base of the fireplace assembly to
the approximate location of the bottom of the termination
cap.
• Subtract the effective height of the fireplace assembly
(see Figure 8.2) from the total vertical height to determine
the overall height of the chimney installation.
• Create a schematic for your application similar to Figure
8.2 showing components required (referring to Table
8.1). Figure 8.1 identifies those components and where
used.
• Install a ceiling firestop whenever the chimney penetrates
a floor/ceiling.
NOTICE: A maximum of two pairs of offsets and returns
may be used.
CAUTION! Risk of Fire and/or Asphyxiation! DO
NOT connect this fireplace to a chimney flue servicing
another appliance.
DO NOT
connect to any air distribu-
tion duct or system. These actions could cause over
-
heating/fire in the chimney flue, or release of exhaust
fumes into the living areas.
Heat & Glo • HST-42D • 27177 • Rev AF • 1/11
HEIGHT OF CHIMNEY COMPONENTS
in.
mm
Chimney Stabilizer
SL3
4-3/4
121
Ceiling Firestops
FS338
0
0
FS339
0
0
FS340
0
0
Offsets/Returns
SL315
13-3/8
340
SL330
15-1/2
394
Roof Flashing
RF370
0
0
RF371
0
0
Chimney Sections*
SL306
4-3/4
121
SL312
10-3/4
273
SL318
16-3/4
425
SL324
22-3/4
578
SL336
34-3/4
883
SL348
46-3/4
1187
* Dimensions reflect effective height.