Model SMD-301V
Application
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).
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)
Maximum Pressure: 4 in. wg (1 kPa)
Maximum Temperature: 350ºF (177ºC)
Construction Standard Optional
Frame Material Galvanized Steel -
Frame Material
Thickness
Frame Type
Blade Material Galvanized Steel -
Blade Material
Thickness
Blade Type Double Skin Airfoil -
Linkage
Axle Bearings 304SS -
Axle Material Plated Steel -
Blade Seals Silicone -
Jamb Seals 304SS -
16 ga. (1.5mm) -
5 in. x 1in.
(127mm x 25mm)
hat channel
14 ga. (2mm)
Equivalent
Plated Steel Out
of Airstream,
Concealed in Jamb
-
-
-
Smoke Dampers
Steel Airfoil Blades
UL 555S Leakage Class I
Model SMD-301V meets the requirements for smoke
dampers established by:
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)
“UL CLASSIFIED (see complete marking on
product)”
“UL CLASSIFIED to Canadian safety standards
(see complete marking on product)”
Standard 555S (Listing #R13317)
W*
H*
Size Limitations
W x H
Minimum
Size
2000 fpm (10.2 m/s)
Inches 6 x 8 50 x 32 100 x 32
mm 152 x 203 1270 x 813 2540 x 813
4000 fpm (20.3 m/s)
Inches 6 x 8 50 x 32 -
mm 152 x 203 1270 x 813 -
Maximum Size
Single
Section
Multiple Section
*W&H dimensions furnished approximately 1/4 in. (6mm) undersize.
(add sleeve thickness for overall sleeved damper dimension).
Features:
• Frames are constructed with reinforced corners.
Low profile head and sill are used on sizes less than
17 in. high (432mm).
• Blades are double skin airfoil shape of galvanized
steel with full length structural reinforcement
• Actuators: 24V, 120V, 230V, Pneumatic
Installation instructions available at www.greenheck.com
5D 6D
5D
D
4 (W) (H)
3.14
5D 6D
AMCA 5.2 Pressure Drop SMD-301V
Options for SMD-301V:
• Factory mounted accessories
- Retaining angles
- Quick connect breakaway connections
- S & drive connections
- Access doors
• Greenheck test switches (GTS-3 & GTS-4)
• Momentary test switch
• POC retaining angles
• OCI (Open closed indication switches)
• Sealed transitions and sleeves
• Security bars
• Smoke detectors
• Transitions: R, C, O
Pressure Drop Data
This pressure drop testing was conducted in accordance with AMCA Standard 500-D using the three configurations shown. All
data has been corrected to represent standard air at a density of .075 lb/ft
Actual pressure drop found in any HVAC system is a combination of many factors. This pressure drop information along with an
analysis of other system influences should be used to estimate actual pressure losses for a damper installed in a given HVAC
system.
AMCA Test Figures
Figure 5.3 Illustrates a fully ducted damper. This configuration has the lowest pressure drop of the three test configurations
because entrance and exit losses are minimized by straight duct runs upstream and downstream of the damper.
Figure 5.2 Illustrates a ducted damper exhausting air into an open area. This configuration has a lower pressure drop than
Figure 5.5 because entrance losses are minimized by a straight duct run upstream of the damper.
Figure 5.5 Illustrates a plenum mounted damper. This configuration has the highest pressure drop because of extremely high
entrance and exit losses due to the sudden changes of area in the system.
3
(1.2 kg/m
3
).
5D 6D
Figure 5.3
5D
Figure 5.2
D
4 (W) (H
3.14
)
Figure 5.5
12x12
24x24
AMCA 5.2 Pressure Drop SMD-301V
5D 6D
D
4 (W) (H)
3.14
Velocity
(fpm)
Pressure Drop
(in. wg)
Velocity
(fpm)
Pressure Drop
(in. wg)
500 0.01 500 0.01 500 0.02
1000 0.06 1000 0.05 1000 0.08
1500 0.12 1500 0.12 1500 0.18
2000 0.22 2000 0.21 2000 0.33
2500 0.34 2500 0.33 2500 0.51
3000 0.49 3000 0.48 3000 0.74
3500 0.67 3500 0.65 3500 1.00
4000 0.88 4000 0.85 4000 1.31
12in. X 48 in. (305mm x 1219mm
)()
36in. x 36 in. (914mm x 914mm)
5D
* Sizes are in inches.
12 in. x 12 in. (305mm x 305mm)
Velocity
(fpm)
500 0.03 500 0.01
1000 0.12 1000 0.06
1500 0.26 1500 0.12
2000 0.46 2000 0.22
2500 0.72 2500 0.34
3000 1.04 3000 0.49
3500 1.41 3500 0.67
4000 1.84 4000 0.87
Pressure Drop
(in. wg)
24 in. x 24 in. (610mm x 610mm)
Velocity
(fpm)
Pressure Drop
(in. wg)
12x12
24x24
AMCA 5.3 Pressure Drop SMD-301V
Velocity (fpm)
Pressure Drop
(in. wg) Velocity (fpm)
Pressure Drop
(in. wg) Velocity (fpm)
500 0.01 500 0.01 500 0.01
1000 0.02 1000 0.02 1000 0.04
1500 0.05 1500 0.06 1500 0.10
2000 0.09 2000 0.10 2000 0.18
2500 0.14 2500 0.16 2500 0.29
3000 0.21 3000 0.24 3000 0.42
3500 0.29 3500 0.33 3500 0.57
4000 0.38 4000 0.43 4000 0.74
)
36in. x 36 in. (914mm x 914mm
)
12in. X 48 in. (305mm x 1219mm
)()
)
5D 6D
* Sizes are in inches.
12 in. x 12 in. (305mm x 305mm
24 in. x 24 in. (610mm x 610mm
Pressure Drop
Velocity (fpm)
500 0.01 500 0.01
1000 0.06 1000 0.02
(in. wg) Velocity (fpm)
1500 0.13 1500 0.06
2000 0.23 2000 0.10
2500 0.37 2500 0.16
3000 0.53 3000 0.23
3500 0.73 3500 0.32
4000 0.95 4000 0.42
Pressure Drop
(in. wg)
12x12
24x24
AMCA 5.5 Pressure Drop SMD-301V
5D 6D
5D
D
4 (W) (H)
3.14
Velocity
(fpm)
Pressure Drop
(in. wg)
Velocity
(fpm)
Pressure Drop
(in. wg)
500 0.03 500 0.03 500 0.03
1000 0.12 1000 0.12 1000 0.14
1500 0.27 1500 0.27 1500 0.32
2000 0.48 2000 0.49 2000 0.57
2500 0.75 2500 0.77 2500 0.89
3000 1.08 3000 1.11 3000 1.28
3500 1.48 3500 1.51 3500 1.75
4000 1.93 4000 1.97 4000 2.29
)
36in. x 36 in. (914mm x 914mm
)
12in. X 48 in. (305mm x 1219mm
)()
)
12 in. x 12 in. (305mm x 305mm
Velocity
(fpm)
Pressure Drop
500 0.04 500 0.03
1000 0.18 1000 0.13
1500 0.42 1500 0.29
2000 0.75 2000 0.52
2500 1.17 2500 0.81
3000 1.68 3000 1.17
3500 2.29 3500 1.60
4000 2.09 4000 2.14
(in. wg)
24 in. x 24 in. (610mm x 610mm
Velocity
(fpm)
Pressure Drop
(in. wg)
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
These dimensions are furnished approximately 1/4 in. (6mm) undersize, except round and oval dimensions which are approximately 1/8 in. (3mm) undersize.
*
Ts = (2)(Sleeve Thickness)
s
16 in. (406mm)
Min.
TYPE R
D*
H* + 2 in. (51mm)+T
2 1 / 8 in.
(54mm)
s
16 in. (406mm)
Min.
(54mm)
*
W
TYPE O
2 1 / 8 in.
H* + 2 in. (51mm)+T
H*
s
16 in. (406mm)
Min.
W*
TYPE C
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.
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.
(2mm) Damper frame shall be galvanized steel formed into
a structural hat channel shape with reinforced corners.
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.
Damper must be rated for mounting vertically (with blades
running vertical) and be UL 555S rated for leakage and airflow in either direction through the damper.
The basis of design is Greenheck Model SMD-301V.
2 1 / 8 in.
(54mm)
H*
Damper blades shall be of the double skin airfoil type
and shall have an equivalent metal thickness of 14 ga.
Copyright ©2009 Greenheck Fan Corporation
SMD-301V Rev 5 November 2009
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