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
"
11/2" max.
B*
S
T*
damper sleeve dimensional data
The drawings below and corresponding table show the position of the FSD-312 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.
Actuators and Accessories
space envelopes
Externally mounted actuators always require space
outside of the damper sleeve. The “S” dimension il
-
lustrates 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 clear-
ance requirements for some dampers less than 18 in.
(457 mm) 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 evalu
-
ated.
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
"
11/2" max.
B*
S
T*
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. (152 mm) to 12 in. (305mm) for the "A"
dimension.
*With the exception of dampers 10 in. high (254mm) or less.
NOTE: Entire damper frame is not required to be installed within the
wall. The damper blades, when closed should be contained within
the wall.
in. (mm)
"A" Dimension
Standard
Maximum
All Dampers*
7 3/16 (183)
12 (305)
When H is 11 in. (279mm) or
less with OCI, RRL, or TOR
12 (305)
12 (305)
* For dampers 18 in. (457mm) or more in height these dimensions are 0 in. .
Actuator Type/Model
B*
T*
S
With
RRL, RRL/OCI, or TOR
With
RRL, RRL/OCI, or TOR
120 Volt AC
ML-4XXX Series Honeywell
5¼ in. (133mm)
¾ in.(19mm)
6 in. (152mm)
MS-4XXX Series Honeywell
6 in. (152mm)
3/8 in. (10mm)
6 in. (152mm)
MS-4120 Series Honeywell
6 in. (152mm)
3/8 in. (10mm)
6 in. (152mm)
24 Volt AC
ML-8XXX Series Honeywell
5¼ in. (133mm)
¾ in.(19mm)
6 in. (152mm)
MS-8XXX Series Honeywell
6 in. (152mm)
6 in. (152mm)
6 in. (152mm)
MS-8120 Series Honeywell
6 in. (152mm)
6 in. (152mm)
6 in. (152mm)
Pneumatic (25 psi min.)
331-4551 Powers
1 in. (25mm)
6¼ in. (159mm)
6½ in. (165mm)
331-2976 Powers
2 3/8 in. (60mm)
12 1/8 in. (308mm)
9¼ in. (235mm)
MK2-7121 Invensys
3 3/4 in. (95mm)
16½ in. (419mm)
10 in. (254mm)
