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Model SMD-301M 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)
APPLICATION
Model SMD-301M is a leakage rated modulating smoke damper
with class I leakage. The SMD-301M serves the function of both
a control damper and smoke damper. High strength airfoil blades
insure lowest resistance to airflow in HVAC systems with velocities
to 2000 fpm (10.2m/s) and 4 in. wg (1 kPa) Model
SMD-301M may be installed vertically (with blades running hori-
zontal) or horizontally and is rated for airflow and leakage in either
direction.
UL 555S Leakage Rating
Leakage Class: I
Operational Rating
Maximum Velocity: 2000 fpm (10.2m/s)
Maximum Pressure: 4 in. wg (1 kPa)
Maximum Temperature: 250ºF (121ºC)
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: Double skin airfoil shape of
galvanized steel with full length
structural reinforcement. 14 ga.
(2 mm) equivalent thickness.
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 6 in. H
(203mm W x 152mm H)
Maximum Size:
Single Section - 32 in. W x 50 in. H
(813mm W x 1270mm H)
Multiple Section - 128 in. W x 100 in.
(3251mm W x 2540mm H)
OPTIONAL FEATURES:
• Galvanized steel sleeves.
• Stainless steel bearings
• OCI (Open closed indication switches)
• Electric actuators to accomplish smoke management and system
functions.
• Transitions (R, C, O)
• POC retaining angles
• Momentary Switch
• Smoke detectors
• Sealed transitions and sleeves
Model SMD-301M
Smoke Dampers
Steel Airfoil Blades
UL 555S Leakage Class I
*W&H dimensions furnished approximately
1
/4 in. (6mm) undersize.
Right hand drive is shown. Left hand drive is available upon request.
Damper also may be rotated 180° in the field for opposite side drive.
(Add sleeve thickness for overall sleeved damper dimension)
H*
W*
LH
RH
“UL CLASSIFIED (see complete marking on
product)”
“UL CLASSIFIED to Canadian safety standards
(see complete marking on product)”
Standard 555S (Listing #R13317)
R
Greenheck Fan Corporation certifies that the
model SMD-301M shown herein is licensed to
bear the AMCA Seal. The ratings shown are
based on tests and procedures performed in
accordance with AMCA Publication 511 and
comply with the requirements of the AMCA
Certified Ratings Programs. The AMCA Certi-
fied Ratings Seal applies to air performance
ratings only.
Installation instructions available at www.greenheck.com