Application
Model OFSD-311 is an ‘out of the wall’ high performance combination
fire smoke damper with class I leakage. OFSD-311 is approved for
use in walls, partitions, and floors with fire resistance ratings less
than 3 hours. Removal of wall grille allows access to actuator and
other components. High strength airfoil blades insure the lowest
resistance to airflow in HVAC systems with velocities to 3000 fpm
(15.2 m/s) and pressures to 4 in. wg (1 kPa). Model OFSD-311 shall
be installed vertically (with blades running horizontal) or horizontally
and is rated for airflow and leakage in either direction.
Ratings
UL555 Fire Resistance Rating:
Fire Rating:
1
1
⁄
2
hours in walls
Dynamic Closure Rating:
Actual ratings are size dependent
Max. Velocity:
up to 3000 fpm (15.2 m/s)
Max. Pressure:
4 in. wg (1 kPa) - differential pressure
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)
Max. Temperature:
350ºF (177ºC)- depending upon the
actuator
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.
Blades:
Double skin airfoil shape of
galvanized steel with full length
structural reinforcement. 14 ga.
(2mm) equivalent thickness.
Seals:
Extruded silicone rubber blade seals.
Flexible stainless steel jamb seals.
Linkage:
Concealed in jamb
Closure Device:
RRL 165°F (74ºC)
Axles:
1
⁄
2
in. (13mm) dia. plated steel
Bearings:
Bronze sleeve type
Sleeve:
Galvanized; wrapped with thermal
blanket
Size Limitations:
Minimum Size:
12 in.W x 12 in. H
(305mm x 305mm)
Maximum Size:
Single section:
32 in. W x 30 in. H
(813mm W x 762mm H)
Multiple Section:
36 in.W x 36 in. H
(914mm x 914mm)
OptiOnAL FeAtuReS:
• POC retaining Angles
• RRL/OCI (open closed indication switches)
• 165ºF (74ºC), 212ºF (100ºC), 250ºF (121ºC), 350ºF (177ºC) RRL’s
available
• TOR (remote override allows damper to perform smoke
management functions during fire emergency.)
• Electric or pneumatic actuators to accomplish smoke
management and system functions.
• Smoke detectors
• Momentary switch
• PRV (pneumatic relief valve)
• Security bars
•Sealed transition and sleeves
Model OFSD-311
Out of Wall Combination Fire Smoke Dampers
Steel Airfoil Blades
UL 555S Leakage Class I
UL555 1
1
⁄
2
Hour Fire Resistance Rating
Horizontal or Vertical Mount
“uL CLASSiFieD (see complete marking on
product)”
“uL CLASSiFieD to Canadian safety standards
(see complete marking on product)”
Standard 555 & 555S (Listing #R13317)
* W & H dimensions furnished approximately
1
⁄
4
in. (6mm) undersize.
(Add blanket thickness (
1
⁄
8
in.[3mm]) and sleeve thickness for
overall sleeved damper dimension)
Oversize wall opening as follows:
Nominal damper size plus
3
⁄
8
in.(9.5mm) (
see page 6
)
R
Greenheck Fan Corporation certifies that the
model OFSD-311 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.
Model OFSD-311 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
SBCCi Standard 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)
installation instructions available at www.greenheck.com
