Figure 6 - maximum chimney heights and support, Table 7 – DuraVent DuraStack Installation User Manual
Page 6
* MVS = Maximum Vertical Spacing between two guides or a support and
a guide in a vertical position.
** H = Maximum freestanding Height above the roof.
*** MHS = Maximum Horizontal Spacing between two guides or a support
and a guide is 12 feet.
THERMAL EXPANSION
Good installation practice requires that any length of exhaust system
between two fixed points subject to more than 1/4 inch expansion must
have an Adjustable Length (LA) or Bellows Joint (LB) to compensate
for expansion. Models DIS and DAS will expand approximately 1 inch
for every 100°F temperature rise per 100 feet of chimney. To accom-
modate chimney movements, any wall guide or floor guide must be
located away from the locking band.
It.is.essential.that.these.parts.be.properly.installed.and.provided.with.
adequate.support.and.guidance.to.prevent.binding.or.excessive.bend-
ing.forces..(See.detailed.installation.information.contained.on.page 19,.
Thermal Expansion).
6
SUPPORT METHODS AND HEIGHT LIMITS
1.. .Several.support.and.guiding.methods.are.used.to.anchor.a.chimney.
against.upward,.downward.and.angular.displacement.
2.. .These.supports.and.guides.used.with.thermal.expansion.devices,.
prevent.bending.stresses.on.the.chimney.elbows.and.joints.
3.. Supports.and.guiding.methods.and.installation.are.described.in.Sec-
tion.C..Certain.limitations.apply.for.proper.installation.of.supports.
and.guides...See tables 6 and 7.
NOTE: When the
maximum height from
table 6 is exceeded, re-
support using another
support and expansion
joint.
Figure 6 - Maximum chimney heights and support
“ M V S ” d i m e n -
sion see table 7 for
Maximum Vertical
Spacing between two
guides or a support
and a guide.
NOTE:.DIAGRAMS.&.ILLUSTRATIONS.ARE.NOT.TO.SCALE.
SUPPORT AND GUIDE SPACING FOR MODEL DIS AND DAS
Inside
Diameter (in)
MVS*
H**
MHS***
Interior
Exterior
5
10
8
10
12
6
10
8
10
12
8
10
8
10
12
10
10
8
10
12
12
10
8
10
12
14
10
8
10
12
16
10
8
10
12
18
10
8
10
12
20
10
8
10
12
22
10
8
10
12
24
10
8
10
12
26
10
8
10
12
28
10
8
10
12
30
10
8
10
12
32
10
8
10
12
34
10
8
10
12
36
10
8
10
12
Table 7
- Dimensions are in feet
See Dim. “H” figure 7
and Chimney Guying
and Bracing in this
section.
Maximum
height - See
table 6
MVS
MVS
MVS
Termination
Storm collar (SC)
Roof support (RS)
Wall guide (WG)
Floor guide (FG)
Wall support (WS)
MAXIMUM CHIMNEY HEIGHTS AND SUPPORT METHOD FOR MODEL DIS AND DAS
Inside
Diameter
(in)
Anchor
Plate
(AP)
Anchor Plate
with Length
(APL)
Ventilated
Anchor Plate
(APV)
Wall Support (WS)
Tee
(T)
Metal Frame Only
Metal Frame
OR Wood
Frame
Metal
Frame
Wood
Frame
DIS/DAS
DIS
DAS
DIS/DAS
DIS/DAS
DIS/DAS
5
147
200
200
133
147
61
105
6
128
200
200
116
128
53
92
8
103
200
200
93
106
43
74
10
86
177
200
78
86
35
61
12
73
152
194
66
73
30
53
14
64
133
175
58
64
27
46
16
57
118
146
52
57
24
41
18
53
106
135
48
53
22
38
20
48
97
125
43
48
20
34
22
44
89
117
40
44
18
31
24
37
76
92
34
37
15
27
26
35
71
88
32
35
14
25
28
33
66
83
30
33
13
23
30
31
63
76
28
31
13
22
32
29
59
73
26
29
12
21
34
27
56
70
25
27
11
20
36
26
53
65
23
26
11
18
Table 6 - Dimensions are in feet