16 table 11 minimum offset – M&G DuraVent DuraStack® User Manual
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16
Table 11
Minimum Offset
Ø
3
°
15
°
30
°
45
°
5"
n/a
1 3/8"
3 5/16"
5 5/8"
6"
n/a
1 7/16"
3 7/16"
5 15/16"
8"
n/a
1 ½"
3 ¾"
6 ½"
10"
n/a
1 9/16"
4"
7 1/16"
12"
n/a
1 5/8"
4 ¼"
7 11/16"
14"
n/a
1 11/16"
4 ½"
8 ¼"
16"
n/a
1 ¾"
4 13/16"
8 7/8"
18"
n/a
1 7/8"
5 1/6"
9 7/16"
20"
n/a
1 15/16"
5 5/16"
10"
22"
n/a
2"
5 5/8"
10 5/8"
24"
n/a
2 1/16"
5 7/8"
11 3/16"
26"
n/a
2 1/8"
6 1/8"
11 ¾"
28"
n/a
2 3/16"
6 3/8"
12 3/8"
30"
n/a
2 ¼"
6 11/16"
12 15/16"
32"
n/a
2 5/16"
6 15/16"
13 ½"
34"
n/a
2 3/8"
7 3/16"
14 1/8"
36"
n/a
2 7/16"
7 ½"
14 11/16"
9. The ends of any sloped or horizontal offset
must be anchored to prevent overstressing
elbows and to assure proper operation of
expansion joints.
10. The vertical sections of chimney above
the offset must also be supported or
anchored and guided where necessary.
11. Models DIS and DAS Roof Support (RS),
Wall Support (WS), Wall Guide (WG) may be
used in a variety of ways for offset support to
achieve the structural stability of the chimney
system. Preferred methods of using model DIS
and DAS supports are shown in Section C.
12. Re-supports such as those shown in
Figure 30 must be securely anchored to walls,
posts, or locally fabricated rigid framework.
This framework must be designed to assure
stability of attached model DIS supports,
such as Anchor Plate (AP) supports and Wall
Supports (WS).
13. Supports suspended by threaded rods or
from small size angles or straps are usually
not satisfactory to resist bending moments
due to offsets.
SECtIon C- StruCturaL Support
anD guIDIng
anCHor pLatE SuppLy
1. The anchor plate support assembly is
designed to provide maximal support to
vertical sections and to provide fixed point
support for horizontal sections.
2. The plate support must be attached to the
building structure or supported with rigid
structural members (see Figure 21 and Table
12 for bracing dimensions)
3. Do not attaCH tHE anCHor pLatE
to ComBuStIBLE ConStruCtIon. If
unavoidable, use the Ventilated Anchor Plate
support assembly.
4. The anchor plate consists of a plate
and eight clamp flange. See Figure 20 for
sectional details for plate support.
5. Important: The surfaces of the male and
female couplings in contact with the plate of
Figure 19
* See Table 11
Offset *