CFM Corporation ODSHR42 - Manual (Page 7)

7
ODSHR Outdoor Woodburning Fireplace
20002264
Planning Information
The Ten Foot Rule
Major U.S. building codes specify a minimum chimney
height above the roof top. The “Ten Foot Rule” is a fire
safety rule and not a draft rule. To ensure proper draft,
it is recommended that you always meet or exceed the
“Ten Foot Rule,” especially when installing a termina-
tion on a high pitch roof. (Fig. 8)
The key points of the "Ten Foot Rule" are:
1. If the horizontal distance from the chimney to the
peak of the roof is 10' (3 m) or less, the top of the
chimney must be at least 2' (610 mm) above the
peak of the roof, but never less than 3' (914 mm)
in height above the highest point where it passes
through the roof.
2. If a horizontal distance from the chimney to the
peak of the roof is more than 10' (3 m), a chimney
height reference point is established that is on
the surface of the roof a distance of 10' (3m) from
the chimney in a horizontal plane. The top of the
chimney must be at least 2' (610 mm) above the
reference point, but never less than 3' (914 mm)
in height above the highest point where it passes
through the roof.
Preplanning an installation is very important to ensure
safety and to save time and money. An installer must
predetermine where a fireplace will be set and how the
chimney system will be run.
Mounting the Fireplace
A fireplace may only be mounted on the following sur-
faces:
1. A flat combustible surface.
2. A raised wooden platform.
3. A concrete block or other solid object placed beneath
each of the four (4) corners of the fireplace.
The fireplace must be spaced 3/4" (19 mm) from a
combustible back wall and 3/4" (19 mm) from a com-
bustible side wall or support. (Fig. 20, Page 14)
Planning the Chimney Run
Determine how the chimney will be run, length of run
and chimney components required to complete the
job. (Fig. 7) Never install a chimney below minimum
heights.
In planning a chimney system, it is important to know:
1. The height of a chimney is measured from the
hearth to the exit point on the termination.
2. A chimney cannot be offset more than 30° from a
vertical plane.
3. A chimney may run straight up or it may be neces-
sary to offset it to avoid obstructions.
4. The maximum length of an angled run (total chimney
system) is 20' (6 m).
5. No more than 2 offsets (4 total 30° elbows in) per
fireplace may be used.
6. A guy wire stabilizer is required for chimneys extend-
ing more than 6' (1.8 m above a roof line.
Fig. 7 Installed lengths of chimney sections.
FP288b
L1
L1
LT
11CF
Chimney
Model No.
Total
Length
(LT)
Installed
Length
(L1)
11CF1
11CF18
11CF3
11CF4
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FP288B
11CF
SHR SERIES
5/11/99 djt
AC246
Fig. 8 Ten Foot Rule illustration.
2' Min.
2' Min.
3'
Min.
0 To 10'
3'
Min.
0 To 10'
AC246
4/1/96
Reference
Point