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Face and Bypass Damper Linkage —
bypass damper sections are shipped completely assembled
and operational. Sizes 07-11 are built as single assemblies.
Sizes 13-61 have two damper assemblies linked by a jack-
shaft. Sizes 74 and 92 have 3 damper assemblies linked by
two jackshafts.
DAMPER
SECTION
BOTH DAMPERS
INTERCONNECTED
EACH DAMPER
SEPARATE
EXHAUST AIR
FACE & BYPASS
ZONE DAMPERS
(see Note 2)
No. of Zones
*Observe the following cautions:
Do not exceed 3 in. wg negative pressure in these damper
sections.
Factory duct collars and damper assemblies are for attach-
ment of ductwork only and must not be used to support the
weight of the duct. Weight bearing deflection can increase
torque necessary to operate dampers, or bind them pre-
venting any movement.
All face and
Table 18 — Damper Operating Torque (lb-in.)
07
09
11
MXB*
26
35
42
FMB*
MXB*
22
29
35
FMB*
EXB*
22
29
35
FBP
35
45
55
ZDS
12
12
12
5
5
6
All damper crankarms have 90 degrees of travel from open
to closed. They can be adjusted to suit the actuator location.
The face and bypass operating shaft is extended through
both sides of the unit. Actuators can be linkage connected or
direct connected. For direct conection actuators remove factory-
installed crankcarm. See Table 18 for operating torque
requirements.
39T UNIT SIZE
13
17
21
26
49
66
80
100
122
41
55
67
83
102
41
55
67
83
102
65
85
105
130
160
12
12
12
12
7
7
7
8
NOTES:
1. Damper shaft moves 90 degrees from open to closed position.
2. Operating torque is shown for one zone. Multiply the value shown
by the number of zones for total with one actuator.
3. See Table 1 for section identification.
44
32
39
49
61
150
188
232
125
157
194
125
157
194
194
245
305
12
12
12
12
9
9
11
12
74
92
260
352
217
294
217
294
370
460
12
12
14
14
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