Chimney Height Requirements; Determining The Number Of Chimney Sections Required - Heat-N-Glo RHW-44 Installation & Operating Instructions Manual

RHW-44 WOODBURNING FIREPLACE

2. CHIMNEY HEIGHT REQUIREMENTS

(Above the roof line)
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.
See Figure 9.
Figure 9
Chimney Height
If the horizontal distance from the side of the chim-
ney 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
3-00
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.
These chimney heights are necessary in the interest
of safety and do not ensure smoke-free operation.
Trees, buildings, steeply pitched roofs, adjoining roof
lines, adverse wind conditions, etc., may create a
need for a taller chimney should smoking occur.
3. DETERMINING THE NUMBER OF CHIM-
NEY SECTIONS REQUIRED
To determine the chimney components needed to
complete your particular installation, follow the below
steps:
a. Determine the total vertical height of the fireplace
installation. This dimension is measured from the
base of the firebox assembly to the point where
the smoke exits the terminal cap.
b. Subtract the height of the firebox assembly
(47-1/4") from the overall height of the fireplace
installation.
c. Reference the chart below to determine what
components must be selected to complete the
fireplace installation.
d. Determine the number of firestop spacers, stabi-
lizers, roof flashing, etc. required to complete the
fireplace installation.
Height of Chimney Components
Chimney Stabilizer
SL3
Firestop Spacers
FS338
FS339
FS340
Offset/Returns
SL315
SL330
Roof Flashing
RF370
RF371
Chimney Sections*
SL306
SL312
SL318
SL324
SL336
SL348
*Dimensions reflect effective height.
13
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
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