Heatilator CONSTITUTION Installation & Operating Instructions Manual page 12

Constitution
EPA Certified Fireplace
2. Chimney Height Requirements (above roof
line)
a. Major building codes specify a minimum chimney
height above the roof top. These specifications are
summarized in what is known as the Ten Foot Rule.
This rule states:
If the horizontal distance from the side of the
chimney to the peak of the roof is 10 feet or less, the
top of the chimney must be at least 2 feet above
the peak of the roof, but never less than 3 feet
in overall height above the highest point where it
passes through the roof.
If the horizontal distance from the side of the
chimney to the peak of the roof is more than 10 feet,
a chimney height reference point is established on
the surface of the roof a distance of 10 feet from the
side of the chimney in a horizontal plane. The top
of the chimney must be at least 2 feet above this
reference point, but never less than 3 feet in height
above the highest point where it passes through the
roof. See Figure 12A.
b. These chimney heights are necessary in the interest
of safety but do not ensure smoke-free operation.
Trees, buildings, adjoining roof lines, adverse wind
conditions, etc. may create a need for a taller
chimney should smoking occur.
3. Number of Sections Required
To determine the chimney components needed to
complete your particular installation, follow the steps
below:
a. Determine the total vertical height of the fireplace
installation. This dimension is measured from the
base of the fireplace assembly to the point where
the smoke exits the termination cap.
b. Subtract the effective height of the fireplace assembly
from the overall height of the fireplace installation
(measured from the base of the fireplace to the
bottom of the termination cap).
c. Refer to Table 2 to determine what components must
be selected to complete the fireplace installation.
d. Determine the number of firestop spacers, stabiliz-
ers, roof flashing, etc. required to complete the
fireplace installation.
480-1091
Figure 12A- Chimney Height
HEIGHT OF CHIMNEY COMPONENTS
Chimney Stabilizer
SL3
Firestop Spacers
FS338
FS339
FS340
Offsets/Returns
SL315
SL330
Roof Flashing
RF370
RF371
Chimney Sections*
SL306
SL312
SL318
SL324
SL336
SL348
*Dimensions reflect effective height.
12
IF 10
FEET OR
LESS
THEN
MUST BE AT
LEAST 2 FEET
BUT
NEVER LESS
THAN 3 FEET
Table 2
4-3/4"
0"
0"
0"
13-3/8"
14-1/2"
0
0
4-3/4"
10-3/4"
16-3/4"
22-3/4"
34-3/4"
46-3/4"
4-03