18
53D9041
B36LA & B36RA Woodburning Fireplaces
CHIMNEY OFFSET INSTALLATION
NOTE:
If you intend to have a total fireplace installation of more that 30 feet you must use a chimney support at or
below 30 feet to support the weight of additional chimney pipe. If it is impossible to nail the chimney support to the
load bearing framing of the building at the 30 foot level, the chimney support may be installed at a lower level if the
height of the chimney above the support does not exceed 30 feet. Effective height of the chimney support is 16
³⁄₄
”.
Chimney supports must be installed at 30 foot intervals.
To install the chimney support, place the crimped end of the flue and outlet air duct portions into the last section of
chimney pipe. Push down until the outside or inlet air duct of the chimney support overlaps and snap locks the chim-
ney support into the chimney section.
Nail the support straps tightly to a building frame member or ceiling joist as shown by
Figure 18
. You must use at
least two 8-penney nails per strap.
Elbow Installation
NOTE:
If triple wall elbow is to be placed directly to the top of the fireplace, it will be necessary to bend a tab located
on each of the four (4) inlet air collar brackets. Bend these tabs over only when using a triple wall elbow to start a
chimney run. The tabs may be easily bent with your fingers or pliers.
Figure 19
The following are important points that should be observed when installing elbows on the fireplace:
1. The support straps of all elbows not installed directly on top of the fireplace should be nailed securely to the sur-
rounding structure. This allows the support strap to carry the weight of the chimney above the elbow and prevents
this weight from breaking the elbow or chimney sections apart.
Figure 18
2. Elbows should not be used in any combination that inclines the chimney more than 30 degrees from vertical.
3. The limitations on the quantity of elbows per chimney are as follows: If the total height of the fireplace and chim-
ney is—16’0” or more — two elbows may be used in the chimney. 21’ - 0” or more — four elbows may be used
in the chimney.
4. The inclined portions of chimneys that pass through living spaces likely to be used for storage should be enclosed
to avoid contact with and possible damage to the chimney. The minimum air space of two inches between the
chimney and enclosing materials must be maintained.
Figures 20 and 21
illustrate elbow installations.
5. The length of the inclined portion of chimney between elbows must not exceed 6 feet when unsupported or 20
feet if the chimney is supported at six-foot intervals with support such as metal support straps.
6. When enclosing the elbows and inclined portions of the chimney, enclosing materials must be installed vertically
to maintain the required two-inch minimum air space clearance to the chimney at the extremities of the offset. It
is recommended that enclosing material not follow the inclined portions of the chimney.
Offset Installation Sequence
1. Determine the location and amount of offset required, then select the combinations of chimney sections and el-
bows required from the offset chart. Refer to Page 19.
2. Install the first LE30 elbow by placing the extended flue into the mating part of the fireplace or chimney section.
Push down until the outside or inlet air duct of the elbow overlaps and the snaps lock the elbow into the fireplace
or chimney section.
3. Nail the support straps to the framing member with a minimum of two 8-penny nails per strap.
4. Install the sections of pipe between elbows until the proper number of chimney sections have been installed.
5. Install the second elbow to return the run of the chimney to vertical.
6. Nail the support straps of the second elbow to a building frame member.
7. Continue installing the vertical portion of the chimney.
NOTE:
If the inclined portion of the chimney passes through a floor or ceiling, an SF30 firestop spacer should be
installed to provide the firestop and support required. Be sure proper spacing in maintained between the chimney
and combustibles.
Figure 22
