Offset; Deviation - DuraVent DuraTech Canada Installation And Operation Instructions Manual

5
OFFSET DEVIATION
OFFSET CHIMNEY
It may be necessary to offset the chimney to clear
an obstruction such as a joist or truss, or to position
the chimney close to the ridge cap. A maximum of
two offsets (4 elbows in all) is allowed in a chimney.
The chimney must not be inclined more than 30° from
vertical or 45° (Canada Only).
The minimum chimney height when using 15° offsets
is 10'.
The minimum chimney height when using 30° or 45°
offsets is 15'.
The maximum length of unsupported offset chimney
is 6'. If the offset chimney is longer than 6', then it
must be supported at 6' intervals using an Offset
Support (RESU) or Wall Band (WSU).
A support must always be installed right above each
offset (two elbows) to support the chimney above the

offset.

INSTALLATION INSTRUCTIONS
Install the required support and the chimney as de-
scribed in the previous pages of installation instruc-
tions. When you reach the height at which the elbow
will be installed, proceed as follows:
Step 1. Install the insulated offset elbow on the vertical
chimney length. Turn it in the required direction
and fasten it to the chimney with the (4)-1/2''
metal screws provided.
Step 2. Place the required offset chimney length (see
Table 7 below) on the elbow. Turn it clockwise
to lock it in place.
Step 3. Use another elbow to turn the chimney ver-
tically. Again secure the elbow to the chimney
length using the (4)-1/2'' metal screws.
WARNING
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
STORM COLLAR (F
ROOF SUPPORT (ST
(MANDATORY)
FLASHING (F
Figure 14
Step 4. Install the remaining chimney as described in
the instructions for the Roof Support
(See page 15).
INSTALLATION CALCULATIONS
Determine the offset required in view of the obstacles
that must be avoided (see Figure 14). Refer to Table
7 to determine the elbows required as well as the
insulated length needed. If required, an adjustable
length can be used to offset exact distance required.
RAIN CAP
ROOF RADIATION
PLATE (USA ONLY)
4 METAL SCREWS
ELBOW (E)
13