Chimney Requirements - Heatilator ST42A Owner's Manual

A. Chimney Requirements
Vertical distances are measured from the base of the fi re-
place as shown in Figure 5.2.
a. Minimum overall straight height
b. Minimum height with offset/return
c. Maximum height
d. Maximum chimney length between an offset and
return
e. Maximum distance between chimney stabilizers
f. Double offset/return minimum height
g. Maximum unsupported chimney length between the
offset and return
h. Maximum unsupported chimney height above the
fi replace
i. Maximum unsupported chimney above roof
WARNING
Fire Risk
• Must maintain 2 in. (51 mm) air clearance
to insulation and other combustible
materials.
Table 5.1
HEIGHT OF CHIMNEY COMPONENTS
Chimney Stabilizer
SL11
Firestop Spacers
FS538
FS540
Offsets/Returns
SL1130
Roof Flashing
RF570
RF571
Chimney Sections*
SL1106
SL1112
SL1118
SL1136
SL1148
* Dimensions refl ect effective height
16
To determine the chimney components needed to complete
your particular installation, follow the steps below:
•
ft meters
14.0 4.27
16.5 4.93
•
90.0 27.43
10.0 3.05
35.0 10.67
•
22.0 6.71
6.0 1.83
•
35.0 10.67
6.0 1.83
in. mm
4-3/4 121
0 0
0 0
14-1/2 368
Figure 5.2
0 0
0 0
4-3/4 121
10-3/4 273
16-3/4 425 •
34-3/4 883
•
46-3/4 1187
Heatilator • ST42A • 35038 Rev G • 02/05
Determine the total vertical height of the fireplace
installation. This dimension is measured from the base of
the fi replace assembly to the point where the smoke exits
the termination cap.
Subtract the effective height of the fi replace assembly from
the overall height of the fi replace installation (measured
from the base of the fireplace to the bottom of the
termination cap).
Refer to Table 5.1 to determine what components must
be selected to complete the fi replace installation.
Determine the number of fi restop spacers, stabilizers,
roof flashing, etc. required to complete the fireplace
installation.
d & g
firestop
58-7/8 in.
(1495 mm)
Effective
Height

Chimney Requirements

CAUTION
Do NOT connect this fireplace to a chimney flue
servicing another appliance.
Do NOT connect to any air distribution duct or
system.
i
h
a,b,c,f