Greenheck Fan SMD-401M User Manual
APPLICATION
H*
W*
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.
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: Airfoil shape constructed of
heavy gauge extruded aluminum.
Structural reinforcement through
the entire length.
Seals: Extruded silicone rubber blade
seals. Flexible stainless steel
jamb seals.
Linkage: Concealed in jamb.
Axles:
Bearings: Bronze sleeve type.
1
⁄2 in. (13mm) dia. plated steel.
SMD-401M
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
ICBO Uniform Building Codes
New York City (MEA listing #260-91-M)
CSFM California State Fire Marshal
Leakage (Smoke) Damper Listing (#3230-0981:108)
“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:
Minimum Size:
(203mm W x 203mm H)
Maximum Size:
Single Section: 36 in. W x 36 in. H
(914mm W x 914mm H)
Multi Section: 144 in. W x 36 in. H
(3658mm W x 914mm H)
8 in. W x 8 in. H
Optional Features:
• Galvanized steel sleeves.
• Stainless steel bearings
• OCI (Open closed indication switches)
• Electric or pneumatic actuators to accomplish smoke
management and system functions.
• POC Retaining angles
• Smoke detector
• Momentary switch
• Transitions (R, C, O)
• Sealed transitions and sleeves
*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.
Installation instructions available at www.greenheck.com
RH
SMD-401M Pressure Drop Data
5D 6D
5D
D
4 (W) (H
)
3.14
Velocity (fpm)
4 5 6 7 8 9 10
x 100
x 1000
Pressure Loss (in. wg)
10.0
9.0
8.0
7.0
6.0
5.0
4.0
3.0
2.0
2 3 4 5 6 7 8 9 10
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
Velocity (fpm)
4 5 6 7 8 9 10
x 100
x 1000
Pressure Loss (in. wg)
10.0
9.0
8.0
7.0
6.0
5.0
4.0
3.0
2.0
2 3 4 5 6 7 8 9 10
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
Velocity (fpm)
4 5 6 7 8 9 10
x 100
x 1000
Pressure Loss (in. wg)
10.0
9.0
8.0
7.0
6.0
5.0
4.0
3.0
2.0
2 3 4 5 6 7 8 9 10
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
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.
Figure 5.3
Figure 5.2
3
(1.201 kg/m3 ).
Figure 5.5
Damper Size
12 in. x 12 in.
(305mm x 305mm)
5.5
5.2
5.3
Damper Size
24 in. x 24 in.
(610mm x 610mm)
5.5
5.2
5.3
Damper Size
36 in. x 36 in.
(914mm x 914mm)
5.5
5.2
5.3
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