Greenheck SMD-401 User Manual
Model SMD-401
H*
W*
APPLICATION
Model SMD-401 is a class I leakage rated smoke damper. High
strength, streamlined extruded airfoil blades insure lowest resistance
to airflow in HVAC systems with velocities to 3000 fpm (15.2 m/s) and
6 in. wg (1.5 kPa). Model SMD-401 may be installed vertically (with
blades running horizontal) or horizontally and is rated for airflow and
leakage in either direction.
RATINGS
Leakage: UL 555S leakage class I. Leakage rated
in both directions
Velocity: Operational rated to 3000 fpm (15.2 m/s)
for sizes up to 48 in. W x 108 in. H or
144 in. H x 36 in. H (1219mm x 2743mm)
or (3658mm x 914mm) or 2000 fpm
(10.2 m/s) for sizes greater than that.
Rating is for airflow in either direction
through damper.
Temperature: 250°F (121°C) with all actuators.
Maximum Pressure: 6 in. (1.5 kPa)
Construction Standard Optional
Frame Material Galvanized steel -
Frame Material
Thickness
Frame Type
Blade Material Aluminum -
Blade Material
Thickness
Blade Type Airfoil -
Linkage
Axle Bearings Bronze 304SS
Axle Material Plated steel 304SS
Blade Seals Silicone -
Jamb Seals 304SS -
16 ga. (1.5mm) -
5 in. x 1in.
(127mm x 25mm)
hat channel
Heavy gauge
aluminum
Plated steel out of
airstream, concealed
in jamb
Double Flange
-
304SS
Smoke Dampers
Extruded Airfoil Blades
UL 555S Leakage Class I
Model SMD-401 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)
California State Fire Marshall
Listing#: 3230-0981:104 (smoke)
“UL CLASSIFIED (see complete marking on
product)”
“UL CLASSIFIED to Canadian safety standards
(see complete marking on product)”
Standard 555S (Listing #R13317)
LH
Size Limitations
W x H
Inches 8 x 8 48 x 60
Inches 8 x 8 48 x 36 144 x 36 or 48 x 108
Inches 8 x 8 48 x 36 -
Minimum
Size
2000 fpm (10.2 m/s); 4 in. wg (1 kPa) pressure
mm 203 x 203 1219 x 1524
3000 fpm (15.2 m/s); 4 in. wg (1 kPa) pressure
mm 203 x 203 1219 x 914
3000 fpm (15.2 m/s); 6 in. wg (1.5 kPa) pressure
mm 203 x 203 1219 x 914 -
Single
Section
Maximum Size
Multiple Section
192 x 72 or 48 x 288
or 384 x 36
4877 x 1829 or 1219 x 7315
or 9754 x 914
3658 x 914 or
1219 x 2743
RH
*W&H dimensions furnished approximately 1/4 in. (6mm) undersize.
(Add sleeve thickness for overall sleeved damper dimension)
Right hand drive is shown. Left hand drive is available upon request.
Features:
• Frames are constructed with reinforced corners. Low
profile head and sill are used on sizes less than 17 in.
high (432mm).
• • Blades are extruded aluminum airfoil, symmetrically
shaped.
• Actuators: 120V, 24V, 230V, Pneumatic
Installation instructions available at www.greeenheck.com
Options & Pressure Drop Data SMD-401
Pressure Loss (in. wg
Options for SMD-401:
• 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
3
(1.201 kg/m3).
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.
Damper Size
10.0
12 in. x 12 in.
9.0
8.0
7.0
6.0
5.0
4.0
3.0
2.0
5.5
5.2
5.3
10.0
9.0
8.0
7.0
6.0
5.0
4.0
3.0
2.0
24 in. x 24 in.
Figure 5.3
Figure 5.2
Figure 5.5
Damper Size
5D 6D
5D
Damper Size
36 in. x 36 in.
10.0
9.0
8.0
7.0
6.0
5.0
4.0
5.5
3.0
2.0
4 (W) (H
D
)
3.14
5.5
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
Pressure Loss (in. wg )
0.10
0.09
0.08
0.07
0.06
0.05
0.04
0.03
0.02
4 5 6 7 8 9 10
x 100
2 3 4 5 6 7 8 9 10
Velocity (fpm)
x 1000
1.0
0.9
0.8
)
0.7
0.6
0.5
0.4
0.3
0.2
0.10
0.09
0.08
0.07
0.06
0.05
0.04
0.03
0.02
4 5 6 7 8 9 10
x 100
2 3 4 5 6 7 8 9 10
Ve locity (fpm)
x 1000
5.2
5.3
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
Pressure Loss (in. wg)
0.10
0.09
0.08
0.07
0.06
0.05
0.04
0.03
0.02
4 5 6 7 8 9 10
x 100
2 3 4 5 6 7 8 9 10
Ve locity (fpm)
x 1000
5.2
5.3
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