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Space Envelopes Required for
Actuators and Accessories
Externally mounted actuators always require space
outside of the damper sideplate or sleeve. The “S”
dimension illustrates the clearance required for various
available actuators.
On dampers less than 18 in. (457mm) high, actuators
may also require clearances above and/or below the
sideplate or sleeve. “B” and “T” dimensions are worst
case clearance requirements for some dampers less
than 18 in. (457mm) high. All damper sizes under 18
in. (457mm) high do not require these worst case
clearances. If space availability above or below the
damper sleeve is limited, each damper size should be
individually evaluated.
Application Data
5
3
/
8
"
5"
Right hand drive is shown
Left hand drive available upon request
LH RH
A
Sleeve Length
Varies
6"
3
3
/
4
"
1
1
/2" max.
B*
S
T*
A
5 in.
12 in.**
6 in.
5
3
/8 in.
5 in.A
Sleeve Length
Varies
3
3
/4 in.
1
1
/2 in. max.
5
3
/
8
"
5"
Right hand drive is shown
Left hand drive available upon request
LH RH
A
Sleeve Length
Varies
6"
3
3
/
4
"
1
1
/2" max.
B*
S
T*
Sideplate
Sleeve
Damper Sideplate and Sleeve Dimensional Data
The drawings below illustrate the factory standard sideplate and sleeve mountings for the SMD-401M. The standard "A"
dimensions listed in the table provide adequate space for the mounting of actuators and controls.
If space constraints are a problem the "A" dimension can be varied between 5
3
⁄8 in. (136mm) and 12 in. (305mm).
* For dampers 18 in.(457mm) or more in height these dimensions are 0 in.
1
Note: This actuator requires field calibration for the zero and span setting.
Actuator Type/Model
B* T*
S
With OCI With OCI
Pneumatic
331-2976 2 1/2 in. (64mm) 5 1/4 in. (133mm) 6 in. (152m)
*With the exception of dampers 11 in. (279mm) high or less (12 in.
(305mm)high or less if width is greater than 64 in. (1625mm)) with OCI
option.
** On dampers 11 in. (279mm) high or less (12 in. (305mm)high or less if
width is greater than 64 in. (1625mm)) with OCI option, sideplate is 16 in.
(406mm)
in. (mm)
"A" Dimension
Sleeve
Sideplate
Standard Maximum
All Dampers* 7 3/16 (183) 12 (305) 6 3/16 (157)
When height is
11 in. (279) or
less with OCI
11 3/16
(284)
12
(305)
10 3/16
(259)