Offset Chart - DuraVent duraplus Installation Instructions Manual

2 pairs of Elbows (4 elbows total) in any one
chimney system.
1. Attach Elbows: Attach Elbows to Chimney
Sections or other Elbows by twisting clockwise
until they lock firmly. Attach one Elbow to the
Chimney Section below, and align it for the
offset. If the needed direction of the Elbow
is different than the fully locked position, the
Elbow can be rotated to desired direction
and can be secured to pipe section with a
minimum of (4) sheet metal screws. Do not
penetrate the inner wall. Refer to Table 3 to
determine the required offset length and attach
an appropriate length (or lengths) of Chimney
Section(s) above the Elbow. Do not exceed
the maximum lengths between the Elbows
specified in Table 3. Attach the second Elbow
above the Chimney Section to complete the
offset. (Figure 17).
SIZE
Elbow Chimney
Degrees Section
15° 0"
15° 12"
15° 24"
15° 36"
15° 24"+24"
30° 0"
30° 12"
30° 24"
30° 36"
30° 24"+24"
DURAPLUS (SDP) OFFSET CHART
6" DIAMETER
Offset Rise Offset
Inches Inches Inches
1 1⁄2" 12"
4 1⁄ 4 "
23 ½"
7 1⁄2" 34"
10 1⁄2" 45 1⁄2" 10 3⁄ 4 "
13 1⁄ 4 " 55 1⁄2" 13 1⁄2"
3 3⁄ 4 " 14 3⁄ 4 "
9" 24"
15" 33 3⁄ 4 "
21" 44"
26 1⁄ 4 " 53"
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. Do not add
more Chimney Sections until the Elbows are
supported. Be sure that the chimney remains
vertical. If the total length of the Chimney
Sections between the two Elbows exceeds 3
feet, install a second Elbow Strap around the
center of the Chimney Section(s).
TABLE 3
7" DIAMETER 8" DIAMETER
Rise Offset
Inches Inches
1 3⁄ 4 " 13 1⁄2" 1 3⁄ 4 "
4 1⁄ 4 " 20 1⁄2" 4 1⁄ 4 "
7 3⁄ 4 " 35 1⁄2" 6 3⁄ 4 "
46 3⁄ 4 " 9 1⁄2"
57" 12"
3 3⁄ 4 " 14 1⁄ 4 " 3 3⁄ 4 "
9" 24" 9"
15" 33 1⁄ 4 " 14 3⁄ 4 "
43 1⁄2" 20 1⁄2"
21"
26" 52 1⁄2" 25 1⁄2"
Rise
Inches
13 1⁄2"
23 1⁄2"
35 1⁄2"
47"
57 1⁄ 4 "
OFFSET
14 3⁄ 4 "
24"
34 1⁄ 4 "
44 3⁄ 4 "
53 3⁄ 4 "
RISE
13