DELTA2 Owner's Manual 15 RSF Woodburning Fireplaces
OFFSET CHIMNEY
An elbow may be installed directly on top of the fireplace if required. See the detailed offset charts in the EXCEL
chimney installation manual. Use the offset option if you need to clear a joist or pass around a cupboard. See
Figure 12 and Figure 13 for examples.
• Maximum offset angle:
• In USA: 30°;
• In Canada: 45°.
• Maximum number of elbows: four, resulting in two offsets and returns.
Install the fireplace and chimney as described earlier. When you require an elbow, proceed as follows:
1. Install the required elbow. Turn it in the desired direction, and fasten it to the other section with 3 metal
screws at the joints.
2. Install enough lengths to obtain the desired offset. Secure each joint with 3 metal screws.
3. Use another elbow to return the chimney to the vertical direction.
4. Install a roof support, a wall support, or an offset support above each offset to support the weight of the
chimney (elbows are not designed to support the chimney above an offset). The support can be installed
anywhere practical along the vertical course of the chimney as long as it is above the offset.
CHASE ENCLOSURE
If the chimney runs up the outside of the house, we recommend that it be enclosed in a chase structure. The
chase should be constructed in such a way that it is an extension of the home. It should be well insulated between
the footings and the floor of the home to prevent heat loss. If the climate in your area is mild, insulate the chase at
least to the first firestop. If the climate in your area is very cold, insulate the chase to the top to keep the chimney
warmer, increase the draft, and reduce creosote buildup.
We also recommend to insulate the ceiling of the chase
just as if it were in the attic space. This will prevent cold air from dropping down through the chase and into the
Radiation
Shield
Use Offset
Support or
Roof Support
R
S
F
F
i
r
e
p
l
a
c
e
Radiation
Shield
3 Metal Screws
in Each Joint
Rise
Offset
Figure 12 Offset Chimney Installation Example
10'
2' min.
Flashing*
with Storm
Collar & Roof
Radiation
Shield
1' min.
Radiation
Shield and
Offset, Roof or
Wall Support
Insulated Wall
Radiation
Shield
(30° or 45°)
*In USA: use a
vented flashing
*In Canada: use a
vented flashing or a
roof radiation shield
with a regular
flashing
RS
F
Fireplace
Figure 13 Offset Chimney Through a Wall Example
