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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#: 3230-0981:108 (smoke)
“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-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)
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 x 203mm)
Maximum Size:
Single Section: 48 in. W x 60 in.
(1219mm W x 1524mm H)
Multiple Section: 192 in. W x 72 in. H
(4877mm W x 1829mm H) or
48 in. W x 288 in. H
(1219mm W x 7315mm H) or
384 in. W x 36 in. H
(9754mm 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
• Transformer
Model SMD-401
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.greeenheck.com