Model SMD-301V
Smoke Dampers
Steel Airfoil Blades
UL 555S Leakage Class I
Application
Model SMD-301V meets the requirements for smoke
dampers established by:
Model SMD-301V is a vertical blade low leakage rated smoke
damper. High strength airfoil blades insure lowest resistance to
airflow in HVAC systems with velocities to 4000 fpm (20.3m/s) and
4 in. wg (1.0 kPa).
National Fire Protection Association
NFPA Standards 92A, 92B, 101 & 105
IBC International Building Codes
New York City (MEA listing #260-91-M)
CSFM California State Fire Marshal
Leakage (Smoke) Damper Listing (#3230-0981:104)
UL555S Leakage Rating
Leakage Class:
I
Operational Rating
Maximum Velocity:
2000 fpm (20.3 m/s) up to
100 in. x 32 in. H
(2540mm x 813mm) or
4000 fpm (20.3 m/s) up to
50 in. x 32 in. (1270mm x 813mm)
4 in. wg (1 kPa)
“UL CLASSIFIED (see complete marking on
product)”
“UL CLASSIFIED to Canadian safety standards
(see complete marking on product)”
Standard 555S (Listing #R13317)
Maximum Pressure:
Maximum Temperature:
350ºF (177ºC)
Standard Construction
Frame:
5 in. x 1 in. (127mm x 25mm)
galvanized steel hat channel with
reinforced corners. A low profile
head and sill are used on sizes
less than 17 in. (432mm) high to
maximize free area and
performance.
Blades:
Seals:
Double skin airfoil shape of
galvanized steel with full length
structural reinforcement. 14 ga.
(2 mm) equivalent thickness.
Extruded silicone rubber blade
seals. Flexible stainless steel
jamb seals.
W*
Linkage:
Axles:
Bearings:
Concealed in jamb.
1/2 in. (13mm) dia. plated steel.
304 stainless steel
Size Limitations:
Minimum Size:
6 in. W x 8 in. H
H*
(152mm W x 203mm H)
Maximum Size:
Single Section:
50 in. W x 32 in.H
(1270mm W x 813mm H)
100 in. W x 32 in. H
(2540mm W x 813mm H)
Multiple Section:
Optional Features:
• OCI (Open closed indication switches)
• Electric or pneumatic actuators to accomplish smoke
management and system functions.
• Transitions (R, C, O)
• POC retaining angles
• Momentary Switch
*W&H dimensions furnished approximately 1/4 in. (6mm) undersize.
• Sealed transitions and sleeves
AMCA 5.2 Pressure Drop
SMD-301V
5D
12x12
24x24
* Sizes are in inches.
Velocity
(fpm)
Pressure Drop
(in. wg)
Velocity
(fpm)
Pressure Drop
(in. wg)
500
0.03
0.12
0.26
0.46
0.72
1.04
1.41
1.84
500
0.01
0.06
0.12
0.22
0.34
0.49
0.67
0.87
1000
1500
2000
2500
3000
3500
4000
1000
1500
2000
2500
3000
3500
4000
AMCA 5.3 Pressure Drop
SMD-301V
5D
6D
24x24
12x12
* Sizes are in inches.
Pressure Drop
Pressure Drop
Velocity (fpm)
(in. wg)
Velocity (fpm)
(in. wg)
500
1000
1500
2000
2500
3000
3500
4000
0.01
0.06
0.13
0.23
0.37
0.53
0.73
0.95
500
0.01
0.02
0.06
0.10
0.16
0.23
0.32
0.42
1000
1500
2000
2500
3000
3500
4000
AMCA 5.5 Pressure Drop
SMD-301V
4
24x2
12x12
Velocity
(fpm)
Pressure Drop
(in. wg)
Velocity
(fpm)
Pressure Drop
(in. wg)
500
1000
1500
2000
2500
3000
3500
4000
0.04
0.18
0.42
0.75
1.17
1.68
2.29
2.09
500
1000
1500
2000
2500
3000
3500
4000
0.03
0.13
0.29
0.52
0.81
1.17
1.60
2.14
Transitioned Damper Dimensions
When a fire/smoke damper is being used in conjunction with round or oval ductwork, the SMD-301V can be supplied in a
factory sleeve with round or oval transitions on both ends of the sleeve. Dampers should be ordered to the duct dimensions.
Drawings below show overall damper size.
D*+
2 in. (51mm) +T
s
W*+ 2 in. (51mm)+T
s
W*+ 2 in. (51mm)+T
s
D*+ 2 in. (51mm)+T
s
H*+ 2 in. (51mm)+T
H*+ 2 in. (51mm)+T
s
s
H*
H*
21/8in.
21/8in.
(54mm)
21/8in.
(54mm)
(54mm)
*
W
W*
D*
16 in. (406mm)
Min.
16 in. (406mm)
Min.
16 in. (406mm)
Min.
TYPE R
TYPE O
TYPE C
These dimensions are furnished approximately 1/4 in. (6mm) undersize, except round and oval dimensions which are approximately 1/8 in. (3mm) undersize.
*
T
= (2)(Sleeve Thickness)
s
Specifications
Smoke Dampers meeting the following specifications
shall be furnished and installed where shown on plans
and/or as described in schedules. Dampers shall meet the
requirements of NFPA 92A, 92B, 101 & 105 and shall be
further tested, rated and labeled in accordance with the
latest edition of UL Standard 555S. Smoke dampers shall
be of low leakage design qualified to UL 555S Leakage
Class I.
Bearings shall be 304 stainless steel sleeve type rotating
in extruded holes in the damper frame. Blade edge seals
shall be silicone rubber designed to inflate and provide a
tighter seal against leakage as pressure on either side of
the damper increases. Jamb seals shall be stainless steel
compression type. Blades shall be completely symmetrical
relative to their axle pivot point, presenting identical
resistance to airflow in either direction or pressure on either
side of the damper.
Each damper/actuator combination shall have a UL555S
elevated temperature rating of 250°F (121º C) minimum and
shall be rated to operate at maximum design air flow at its
installed location. Each damper shall be supplied with an
appropriate actuator installed by the damper manufacturer
at the time of damper fabrication. Damper actuator shall be
(specifier select one of the following) electric type for 120 (24
or 230) volt operation or pneumatic type for 25 psi minimum
(30 psi maximum) operation.
Damper must be rated for mounting vertically (with blades
running vertical) and be UL 555S rated for leakage and air-
flow in either direction through the damper.
The Damper manufacturer's submittal data shall certify all
air performance pressure drop data is tested in accordance
with the AMCA Certified Ratings Program for Test Figures
5.2, 5.3, and 5.5. Damper air performance data shall be
developed in accordance with the latest edition of AMCA
Standard 500-D.
Damper blades shall be of the double skin airfoil type
and shall have an equivalent metal thickness of 14 ga.
(2mm) Damper frame shall be galvanized steel formed into
a structural hat channel shape with reinforced corners.
The basis of design is Greenheck Model SMD-301V.
Copyright ©2007 Greenheck Fan Corporation
SMD-301V Rev 3 June 2007
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