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APPLICATION
Model FSD-331 is a high performance combination fire smoke damper
with extremely low leakage. High strength airfoil blades ensure the
lowest resistance to airflow in HVAC systems with velocities to 2000
fpm (10.2 m/s) and pressures to 4 in. wg (1 kPa). Model FSD-331 may
be installed vertically (with blades running horizontal) and is rated for
airflow and leakage in either direction.
RATINGS
UL 555 Fire Resistance Rating
Fire Rating: 3
hours
Dynamic Closure Rating: Actual ratings are size dependent
Max. Velocity: up to 2000 fpm (10.2 m/s)
Max. Pressure: 4 in. wg (1 kPa)
UL555S Leakage Rating
Leakage Class: I
Operational Rating: Actual ratings are size dependent
Max. Velocity: up to 3000 fpm (15.2m/s)
Max. Pressure: 4 in. wg (1 kPa)
Maximum Temperature: 350°F (177°C)- depending upon the
actuator
STANDARD CONSTRUCTION
Frame: 5 in. x 1 in. (127mm x 25 mm)
galvanized steel hat channel with
reinforced corners. A low profile head
and sill are used on sizes less than
17 in. (432mm)
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.
Closure Device: RRL 165°F (74°C)
Axles:
1
⁄2 in. (13mm) dia. plated steel.
Bearings: Bronze sleeve type.
SIZE LIMITATIONS:
Minimum Size:
8 in. W x 6 in. H
(203 mm W x 152mm H)
Maximum Size (Vertical Only):
Single Section: 32 in. W x 36 in.H
(813mm W x 914mm H) or
30 in. W x 48 in. H
(762mm x 1219mm)
Multiple Section: 120 in. W x 96 in. H
(3048mm W x 2438mm H)
OPTIONAL FEATURES:
• RRL/OCI (Open closed indication switches)
• 165ºF (74°C), 212ºF (100°C), 250ºF (121°C), 350ºF (177°C) RRL's
available
• TOR (remote override closure allows damper to perform smoke
management functions during a fire emergency.)
• Electric or pneumatic actuators to accomplish smoke management
and system functions.
• POC retaining angles
• Smoke detectors
• Momentary Switch
• Transitions (R, C, O)
• PRV (pneumatic relief valve)
• Security Bars
• Sealed transitions and sleeves
Model FSD-331
Combination Fire Smoke Dampers
Steel Airfoil Blades
UL 555S Leakage Class I
UL555 3 Hour Fire Resistance Rating
*W&H dimensions furnished approximately
1
/4 in. ( 6 mm) 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
Model FSD-331 meets the requirements for fire
dampers, smoke dampers and combination fire
smoke dampers established by:
National Fire Protection Association
NFPA Standards 80, 90A, 92A, 92B, 101 & 105
IBC International Building Codes
ICBO Uniform Building Codes
CSFM California State Fire Marshal
Fire Damper Listing (#3225-0981:103)
Leakage (Smoke) Damper Listing (#3230-0981:104)
New York City (MEA listing #260-91-M)
“UL CLASSIFIED (see complete marking on
product)”
“UL CLASSIFIED to Canadian safety standards
(see complete marking on product)”
Standard 555 & 555S (Listing #R13317)
Installation instructions available at www.greenheck.com
R
Greenheck Fan Corporation certifies that the
model FSD-331 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 Certified Ratings Seal applies to air
performance ratings only.