Montana installation instructions – Hearth and Home Technologies Montana-36 User Manual
Page 11
01/04
4039-150 Rev B
11
MONTANA INSTALLATION INSTRUCTIONS
Figure 8 - Chimney Height
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*Dimensions reflect effective height.
Table 2
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, stabilizers,
roof flashing, etc. required to complete the fireplace in-
stallation.
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 ten feet or less, the top of the
chimney must be at least two feet above the peak of the
roof, but never less than three 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 ten feet, a chimney
height reference point is established on the surface of
the roof a distance of ten feet from the side of the chimney
in a horizontal plane. The top of the chimney must be at
least two feet above this reference point, but never less
than three feet in height above the highest point where it
passes through the roof. See Figure 8.
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.