Vermont Casting SC36 - Manual (Page 7)

7
Majestic Fireplaces
®
SR/SC Series
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 1/2 inch from a com-
bustible back wall and 1/2 inch from a combustible
side wall or support. (Fig. 20, Page 14)
Planning The Chimney Run
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
extending more than 6 feet above a roof line.
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 center 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
height above the highest point where it passes
through the roof.
2. If a horizontal distance from the center of the
chimney to the peak of the roof is more than 10 feet,
a chimney height reference point is established that
is on the surface of the roof a distance of 10 feet
from the center of the chimney in a horizontal plane.
The top of the chimney must be at least 2 feet
above the reference point, but never less than 3 feet
in height above the highest point where it passes
through the roof.
Determine how the chimney will be run, length of run
and chimney components required to complete the
job. (Fig. 6) 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 degrees
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 feet.
L1
L1
LT
MODEL SK
2 WALL CHIMNEY
TOTAL
LENGTH
(LT)
INSTALLED
LENGTH
(L1)
SK81
SK818
SK83
SK84 11¹⁄₂
"
17¹⁄₂
"
35¹⁄₂
"
47¹⁄₂
"
10¹⁄₂
"
16¹⁄₂
"
34¹⁄₂
"
46¹⁄₂
"
Fig. 7 Installed lengths of chimney sections.
WF288
AC246
Fig. 8 Ten Foot Rule illustration.
2' MIN.
2' MIN.
3'
MIN.
0 TO 10'
3'
MIN.
0 TO 10'
REFERENCE
POINT