Model SMDR-501 is a round smoke damper with extremely low
leakage. The SMDR-501 has been qualified to 3,000 fpm (15.2 m/s)
and 4 in. wg (1.0 kPa) for operational closure in emergency smoke
control situations, for use in HVAC system applications.
4 in. wg (1.0 kPa) - differential pressure
3000 fpm (15.2 m/s)
350°F (177ºC) depending on the actuator.
20 ga. (1mm) galvanized steel round integral
Double skin galvanized steel (14 ga. [2mm]
equivalent) round style blades
Oil impregnated stainless steel
6 in. diameter (152mm)
24 in. diameter (610mm)
• Electric or pneumatic actuators to accomplish smoke
management and system functions.
• Open/Close Indicator (OCI) for remote indication of blade
• 14 ga. (2mm) or 16 ga. (1.5mm) frame/sleeve
True Round Smoke Dampers meeting the following specifications
shall be furnished and installed where shown on plans and/or as
described in schedules. Dampers shall meet the requirements of the
latest edition of NFPA 92A, 92B, 101 & 105.
Dampers shall be tested, rated and labeled in accordance with the
latest edition of UL Standards 555S. Dampers shall be UL labeled for
use in dynamic systems. The damper shall have a dynamic closure
airflow rating equal to or greater than the airflow at the damper's
installed location and a dynamic closure pressure rating of 4 in. wg
Dampers shall have a UL 555S leakage rating of Class I and a
temperature rating of 250º F (121ºC) minimum. Dampers shall have a
UL555S operational airflow rating equal to or greater than the airflow
at its installed location and an operational pressure rating of 4 in. wg
(1 kPa). Damper actuators shall be factory mounted and qualified for
use with the damper in accordance with UL555S.
in. (13mm) dia. plated steel.
Model SMDR-501 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 #: 2330-0981:104
"UL CLASSIFIED (see complete marking on
"UL CLASSIFIED to Canadian safety standards
(see complete marking on product)"
Standard 555S (Listing #R13317)
* D dimension furnished approximately
Installation instructions available at www.greenheck.com.
Damper actuators shall be (specified select one of the following)
electric type for 120 (or 24) volt operation or pneumatic type for 25 psi
minimum operation (30 psi maximum). Manufacturer's submittal data
shall indicate actuator space requirements around the damper.
All UL555S operational ratings and leakage ratings shall be qualified
for airflow and pressure in either direction through the damper. UL
ratings shall allow for mounting damper vertically or horizontally.
The Damper Manufacturer's submittal data shall certify all air
performance pressure drop data is licensed in accordance with the
AMCA certified ratings program for test figures 5.2, 5.3, and 5.5.
Damper air performance data shall be developed in accordance with
the latest edition of AMCA Standard
Basis of design is Greenheck's model SMDR-501.
Copyright © 2008 Greenheck Fan Corporation
UL 555S Leakage Class I
in. (3mm) undersize.
SMDR-501 Rev. 7 June 2008