DuraVent DuraTech 10-24 Installation - Manual (Page 13)

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are necessary to avoid obstructions such
as rafters, ridgepoles, or joists, you are only
allowed to use 1 pair of Elbows in any one
chimney system.
1. Attach Elbows: Attach Elbow to Chimney
Section or other Elbow by mating the male
and female ends with each other and using
the (6) sheet metal screws provided. Attach
one Elbow to the Chimney Section below,
and align it for the offset. Refer to Table 3 to
determine the required offset length and attach
an appropriate length (or lengths) of Chimney
Section(s) above the Elbow. For each
Chimney Section in the offset, an Elbow Strap
must be used to support the weight of that pipe
section. No more than half of the total chimney
run can be between the elbows (inclined); this
is to ensure the chimney drafts properly (e.g. if
the total chimney run is 20-ft, no more than 10-
ft is allowed to be between 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 two 8-penny nails or #8, 1-1/2” screws.
Do not add more Chimney Sections until
the Elbows are supported. Be sure that the
chimney remains vertical (Fig 15).
EXTENDED ROOF BRACKET
INSTALLATION
If the chimney extends more than 4 feet
above the roofline, an Extended Roof Bracket
must be installed at every 4-foot increment of
chimney height above the roofline, leaving no
more than 4 feet of chimney extending above
the last pipe bracket.
T
Table 3
Elbow Offset Chart
ELBOW
ANGLE FROM
VERTICAL
CHIMNEY
LENGTH
BETWEEN
ELBOWS
OFFSET
INCHES
RISE INCHES
30 ' 0" 6 5/8" 25 1/2"
30 ' 12" 12 7/16" 35 1/2"
30 ' 18" 15 7/16" 40 3/4"
30 ' 24" 18 7/16" 45 15/16"
30 ' 36" 24 1/2" 56 1/4"
Figure 15
CHIMNEY
SECTION
RISE
(INCHES)
ELBOW
ELBOW STRAP
OFFSET
(INCHES)
FRAMING
MEMBER