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)
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.
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:
1
⁄
2
in. (13mm) dia. plated steel.
Bearings:
Bronze sleeve type.
SIzE LIMITATIONS:
Minimum Size:
8 in. W x 8 in. H
(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)
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
SMD-401M
Smoke Dampers
Extruded Airfoil Blades
UL 555S Leakage Class I
*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.
H*
W*
LH
RH
Installation instructions available at www.greenheck.com
