Greenheck OFSD-311 - Manual

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 i n . 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 i n . 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

UL 555 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