DuraVent DuraPlus HTC - Manual (Page 14)

14
the elbows is limited to no more than 50% of
the overall chimney pipe of the system (e.g.
if the total chimney pipe run is 20-ft, then no
more than 10-ft may be between the elbows).
Important: For each chimney pipe section in
the offset (between the elbows), there must
be an Elbow Strap, Tee Support, or similar
support method to support the weight of the
pipe and to relieve stress on the Elbows.
Attach the second Elbow above the Chimney
Section to complete the offset (Fig 15).
2. Secure Offset: Place the Elbow Strap’s
band around the angled portion of the top
Elbow, then tighten the nut and bolt until
the clamp is firm. Wrap the Elbow Strap end
over an adjacent joist or rafter and secure it
with at least (4) 8-penny nails or (4) #8, 1-1/2
screws. Do not add more Chimney Sections
until the Elbows are supported. Be sure that
the chimney remains vertical. If there is more
than one Chimney Section between the
Elbows, install an additional Elbow Strap for
each chimney section in the offset (Fig 15).
OFFSET ELBOW INSTALLATION
Elbows are manufactured in 15°, 30° and 45°
angles measured from the vertical. A 45°
Elbow is the largest that can be used in an
offset in Canada. In the US, the largest elbow
allowed in an offset is 30º. Elbows may not be
combined to create an offset larger than 30°
in the US or larger than 45° in Canada. Avoid
Elbows if possible, since a totally vertical
chimney is more efficient. When Elbows
are necessary to avoid obstructions such as
rafters, ridgepoles, or joists, use no more than
2 pairs of Elbows (4 elbows total) in any one
chimney system.
1. Attach Elbows: Attach Elbow to Chimney
Section or other Elbow by twisting clockwise
until they lock firmly. As an alternative to
twist locking the elbow onto the pipe section,
you may secure the Elbow in place using
(3) 1/2” (13 mm) sheet metal screws. Attach
one Elbow to the Chimney Section below,
and align it for the offset. Refer to the Offset
Chart to determine the required offset length
and attach an appropriate length (or lengths)
of Chimney Section(s) above the Elbow. The
maximum length of chimney pipe between
Figure 15
ELBOW
ELBOW STRAP
RISE
CHIMNEY
SECTION
OFFSET
NO MORE
THAN 50% OF
THE TOTAL
CHIMNEY
RUN CAN BE
BETWEEN THE
ELBOWS
CHIMNEY
SECTIONS
IN OFFSET
EACH ADDITIONAL
CHIMNEY SECTION
IN THE OFFSET MUST
BE SUPPORTED BY
ELBOW STRAP
ELBOW
ELBOW
STRAP