15
Heatilator • ST42A Installation Manual • 4012-051 • Rev C • 10/03/13
d & g
Ceiling Firestop
h
i
58-7/8 in.
(1495 mm)
Effective
Height
a,b,c,f
11-10 in. (279-254 mm)
adapter required in
Canada.
Figure 4.1 Chimney Requirements
NOTICE:
A maximum of two pairs of offsets and returns
may be used.
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.
A. Chimney Requirements
Vertical distances are measured from the base of the
fireplace as shown in Figure 4.1.
4
Chimney and Termination Requirements
Table 4.2 Chimney Component Dimensions
Table 4.1 Chimney Requirements
ft
meters
a. Minimum overall straight height
14.0
4.27
b. Minimum height with offset/return
16.5
5.03
c. Maximum height
90.0
27.43
d. Maximum chimney length between an offset and
return
20.0
6.1
e. Maximum distance between chimney stabilizers
35.0
10.67
f. Double offset/return minimum height
22.0
6.71
g. Maximum unsupported chimney length between the
offset and return
6.0
1.83
h. Maximum unsupported chimney height above the
fireplace
35.0
10.67
i. Maximum unsupported chimney above roof
6.0
1.83
HEIGHT OF CHIMNEY COMPONENTS
in.
mm
US
Canada ONLY
Chimney Stabilizer
SL11
SL4
4-3/4
121
Offsets/Returns
SL1130
SL430
14-1/2
368
Chimney Sections*
SL1106
SL406
4-3/4
121
SL1112
SL412
10-3/4
273
SL1118
SL418
16-3/4
425
SL1136
SL436
34-3/4
883
SL1148
SL448
46-3/4
1187
n/a
SLA10
16-3/4
425
* Dimensions reflect effective height.