Vermont Casting CR36L - Manual (Page 6)

6
CR Series Woodburning Fireplaces
20001316
Planning Information
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
surfaces:
1. A flat combustible surface.
2. A raised wooden platform.
3. A concrete block or other solid object placed be-
neath each of the four (4) corners of the fireplace.
The fireplace must be spaced 3/4 inch from a com-
bustible back wall and 7/16 inch from a combustible
side wall or support. (Fig. 17, Page 12)
Planning the Chimney Run
Determine how the chimney will be run, length of run
and chimney components required to complete the
job. (Fig. 3) Never install a chimney below minimum
heights.
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. 5)
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’ (3m) or less, the top of the
chimney must be at least 2’ (610mm) above the
peak of the roof, but never less than 3’ (914mm)
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’ (3m), a chimney
height reference point is established 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’ (610mm) above the reference point,
but never less than 3’ (914mm) in height above the
highest point where it passes through the roof.
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 chim-
ney system) is 20’ (6m).
5. No more than 2 offsets (4 total 30° elbows in U.S./or
2 total 45° elbows in Canada) per fireplace may be
used.
6. A guy wire stabilizer is required for chimneys ex-
tending more than 6’ (1.8m) above a roof line.
Chimney Supports
The chimney system is supported by the fireplace for
vertical chimney heights less than 20’ (6m) above the
hearth. Chimney supports are required if the vertical
height exceeds 20’ (6m). Locate chimney supports
at ceiling holes or other structural framing at 20’ (6m)
heights. Spacing between chimney supports must not
exceed 20’ (6m). Use Chimney Support Model SKCS8
for SK8 chimney, and Model 11CS for 11CF chimney.
(Note: the chimney support can not be mounted
directly to the fireplace.) Support provided by elbow
straps fulfills the support requirement only if they are
spaced as previously described. (A chimney support is
2¹⁄₂" (64mm) long when installed.)
Fig. 4 Installed lengths of chimney sections.
L1
L1
LT
MODEL SK
2 WALL CHIMNEY
TOTAL
LENGTH
(LT)
INSTALLED
LENGTH
(L1)
SK81
SK818
SK83
SK84
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FP288
MBUF-INSTALLED LENGTH
6/17/96
Fig. 5 Ten Foot Rule illustration.
2' Min.
2' Min.
3'
Min.
0 To 10'
3'
Min.
0 To 10'
AC246
4/1/96
Reference
Point
AC246