Greenheck SMD-401M User Manual
SMD-401M
APPLICATION
Model SMD-401M is a class I leakage rated modulating smoke
damper. The model SMD-401M serves the function of
both a control damper and smoke damper. High strength airfoil
blades ensure the lowest resistance to airflow in HVAC systems
with velocities to 2000 fpm (10.2 m/s ) and 4 wg (1 kPa). Model
SMD-401M may be installed vertically (with blades running
horizontal) or horizontally and is rated for airflow and leakage in
either direction.
RATINGS
Leakage Class: I
Operational Rating: Actual ratings are size dependent.
Max. Velocity: up to 2000 fpm (10.2 m/s)
Max. Pressure: 4 in. wg (1 kPa)
Temperature: 250°F (121ºC) with all actuators.
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
Size Limitations
Smoke Dampers
Extruded Airfoil Blades
UL 555S Leakage Class I
Model SMD-401M 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)
LH
H*
RH
W*
W x H
Inches 8 x 8 36 x 36 144 x 36
mm 203 x 203 914 x 914 3658 x 914
Minimum
Size
Maximum Size
Single
Section
Multiple Section
OPTIONS:
• 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
*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: 24V
Installation instructions available at www.greenheck.com
SMD-401M Pressure Drop Data
Pressure Loss (in. wg)
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.
3
(1.201 kg/m3 ).
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
12 in. x 12 in.
(305mm x 305mm)
10.0
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
Figure 5.3
Figure 5.2
Figure 5.5
Damper Size
24 in. x 24 in.
(610mm x 610mm)
5D 6D
5D
Damper Size
36 in. x 36 in.
(914mm x 914mm)
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
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
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)
5.2
5.3
x 1000
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
5.2
5.3
2 3 4 5 6 7 8 9 10
Velocity (fpm)
x 1000
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