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Actuators and Accessories
Space Envelopes
Externally mounted actuators always require space out-
side of the damper 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 sleeve.
“B” and “T” dimensions are worst case clearance require-
ments 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.
Damper Sleeve Dimensional Data
The drawings below and corresponding table show the position of the SMD-201 damper when mounted in a factory sleeve.
The standard mounting locations provide enough space for the mounting of actuators, controls and allow space for installa-
tion of retaining angles and duct connections.
The standard location of a damper mounted in a factory sleeve ("A" dimension) is shown below. The damper can be
positioned at other locations within a range of 6 in. (152mm) to 12 in. (305mm) for the "A" dimension.
Application Data
5
3
/ 8 in.
5 in.
Right hand drive is show n
Left hand drive available upon re quest
LH RH
A
Sleeve Length
V aries
6 in.
3
3
/ 4
1
1
/ 2 in.
max.
B*
S
T*
in.
5
3
/ 8 in.
5 in.
Right hand drive is show n
Left hand drive available upon re quest
LH RH
A
Sleeve Length
V aries
6 in.
3
3
/
4
1
1
/ 2 in.
max.
B*
S
T*
in.
* For dampers 18 in. (457mm) or more in height these dimensions are 0 in. .
Actuator
Type/Model
B* T* S
With OCI With OCI
120 Volt AC
ML4XXX Series Honeywell 5 1/4 in. (133mm) 3/4 in. (19mm) 6 in. (152mm)
MS4XXX Series Honeywell 6 in. (152mm) 3/8 in. (10mm) 6 in. (152mm)
MS4120 Series Honeywell 6 in. (152mm) 3/8 in. (10mm) 6 in. (152mm)
24 Volt AC
ML8XXX Series Honeywell 5 1/4 in. (133mm) 3/4 in. (19mm) 6 in. (152mm)
MS8XXX Series Honeywell 6 in. (152mm) 3/8 in. (10mm) 6 in. (152mm)
MS8120 Series Honeywell 6 in. (152mm) 3/8 in. (10mm) 6 in. (152mm)
Pneumatic (psi)
331-4551 Siemens 1 in. (25mm) 6 1/4 in. (159mm) 6 1/2 in. (165mm)
331-2976 Siemens 2 3/8 in. (60mm) 12 1/8 in. (308mm) 9 1/4 in. (235mm)
MK2-7121 Invensys 3 3/4 in. (95mm) 16 1/2 in. (419mm) 10 in. (254mm)
*With the exception of dampers 10 in. high (254mm) or less.
NOTE: Entire damper frame is not required to be installed
within the wall.
in. (mm)
"A" Dimension
Standard Maximum
All Dampers* 7 3/16 in. (183) 12 (305)
When Height is
11 in. (279) or less
with OCI
12 (305) 12 (305)