Greenheck HSD-401 Installation Manual

Document number 464604

®

HSD-401

Leakage Rated Smoke Dampers

Vertical or Horizontal Mount

Installation, Operation and Maintenance Instructions

These instructions apply to the installation of HSD-401 series leakage rated smoke dampers. Specific requirements in these
instructions are mandatory. These instructions meet the requirements of UL 555S UL listing R13317.

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H*

W*

HSD-401 Dampers are intended for installation
in accordance with smoke damper requirements
established by:

National Fire Protection Association

NFPA Standards 80, 90A, 92A, 92B, & 105

ICBO Uniform Building Codes
IBC International Building Codes

“UL CLASSIFIED (see complete marking on
product)”
“UL CLASSIFIED to Canadian safety standards (see
complete marking on product)”

UL Standard 555S (Classification #R13317)

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RECEIVING AND HANDLING

Upon receiving dampers, check for both obvious and
hidden damage. If damage is found, record all necessary
information on the bill of lading and file a claim with
the final carrier. Check to be sure that all parts of the
shipment, including accessories, are accounted for.

Dampers must be kept dry and clean. Indoor storage
and protection from dirt, dust and the weather is highly
recommended. Do not store at temperatures in excess of
120°F (49ºC).

SAFETY WARNING:

Improper installation, adjustment, alteration,
service or maintenance can cause property damage,
injury or death. Read the installation, operating,
and maintenance instructions thoroughly before
installing or servicing this equipment.

WARRANTY

Greenheck warrants this equipment to be free from
defects in material and workmanship for a period of one
year from the purchase date. Any units or parts which
prove to be defective during the warranty period will be
repaired or replaced at our option. Greenheck shall not
be liable for damages resulting from misapplication or
misuse of its products. Greenheck will not be responsible
for any installation or removal costs. Greenheck will not be
responsible for any service work or backcharges without
prior written authorization.

This manual is the property of the owner, and is required for future maintenance. Please leave it with the owner when the
job is complete.

Due to continuing research, Greenheck reserves the right to change specifications without notice.

1. SMOKE DAMPER REQUIREMENTS AND
APPLICATION

Smoke dampers are required to close and prevent the

passage of air and smoke through ducts or ventilation
openings in smoke barriers. Smoke dampers are also
applied in engineered smoke control systems to establish
air pressure differentials and thereby prevent the spread
of smoke. HSD-401 damper is designed to operate with
blades running horizontally. Dampers can be vertically or
horizontally installed at, in accordance with NFPA-90A,
or adjacent to the point where the duct passes thru the
smoke barrier.

2. LOCATION OF DAMPER IN DUCTWORK

Place the damper assembly in its proper position relative

to the barrier. The plane of the closed damper blades
must be within 24 in. (610mm) of the rated smoke barrier
and before any duct inlets or outlets.

3. ATTACHING DAMPER TO THE DUCT

HSD-401 damper is a flange mounted to the duct, sleeve,

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or wall opening with

/8 in. (10mm) minimum diameter
bolts and spaced a maximum of 6 in. (152mm) apart, on
center. Dampers can be attached directly to the fan, if
required.

4. SEALING THE INSTALLATION

After installing the damper in the ductwork, seal the

joint between the damper frame and the duct using Dow
Corning RTV 732 Sealant. Make sure to press the sealant
into the joint to guarantee a proper seal. Use the minimum
amount of material required to completely seal the joint.

5. ACTUATOR CONNECTIONS

Electrical and/or pneumatic connections to damper

actuators should be made in accordance with wiring and
piping diagrams developed in compliance with applicable
codes, ordinances and regulations.

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4

1

5

Item Description

1. Damper frame

2. Duct outlet

3. Fan (not limited to centrifugal)

4.

5. Actuator
The actuators are to be installed to function per system
requirements and to be controlled by smoke detection
devices.

FAN ISOLATION APPLICATION

For air handling equipment isolation, leakage rated

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/8 in. (10mm) minimum diameter bolts

dampers are designed to operate with blades running
horizontally. Dampers can be installed in a vertical
or horizontal position. Sealants and damper seal
materials meet the requirements of NFPA90A for smoke
developed rating (<50) and flame spread index (<25) as
tested per UL723/ASTME84-91A/NFPA 255. Dampers
can be attached to the fan system discharge or inlet
without being 24 in. (610mm) of a smoke barrier when
used as an air handling equipment isolation damper.

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Size Limitations

in inches
(mm)

HSD-401 60 x 60

Maximum single
section size

(1524 x 1524)

Maximum single
section size when
multi-section
assembly

48 x 60

(1219 x 1524)

* All multiple section assemblies are factory assembled.

Maximum overall
multi-section size*

120 x 60

(3048 x 1524) or

48 x 120

(1219 x 3048)