Page 1
Document Number 452763
FD, DFD, SSFD, SSDFD, & KFD Models
®
Installation, Operation and Maintenance Instructions
FD, DFD, SSFD, & KFD models are intended for installation in
accordance with fire damper requirements established by:
National Fire Protection Association
NFPA Standard 80, 90A, & 101
IBC International Building Code
CSFM California State Fire Marshal
Fire Damper Listing (#3225-0981:102)
New York City (BSA/MEA listing #260-91-M)
“UL CLASSIFIED (see complete marking on product)”
“UL CLASSIFIED to Canadian safety standards (see complete
marking on product)”
UL Standard 555 (Listing #R13317)
1½ and 3 Hour Curtain Fire Dampers
Vertical and Horizontal Mount
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 shipment 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.
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
100°F (38°C).
Installation Supplements
Refer to the appropriate Greenheck installation supplements
for special requirements:
• Close Indicator Switch
• Concrete Floor with Steel Deck
• Drive Slip Breakaway Connection
• Fire Resistant Ventilated Duct Assembly
• Firestop Material
• Greenheck Test Switch
• Grille Installation
• Metal Stud in Shaftwall
• Quick Connect Breakaway Connections
• Sealant Supplement
• Single Side Retaining Angle
• Single 3-Sided Retaining Angle - Vertical Mount
• Sleeve Extension
• Support Mullions
Note: Refer to Greenheck IOM, Part #461335, for CFSD
models to be installed in corridor ceiling applications.
These instructions apply to 1½ and 3 hour rated fire dampers
mounted (blades must be horizontal) in masonry, block or
stud walls and concrete floors. Specific requirements in these
instructions are mandatory. These instructions meet the
requirements of UL 555. Installation shall comply with the
requirements of NFPA 90A Standard for the Installation of
Air Conditioning and Ventilating Systems. UL listing R13317,
California State Fire Marshal listings 3225-0981:102, and
New York City BSA/MEA listing 260-91-M apply to these
dampers.
Note: Fire dampers are manufactured and labelled for either
vertical or horizontal installation. The dampers must be
installed in accordance with the labelling.
Due to continuing research, Greenheck reserves the right to change specifications without notice.
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.
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Table of Contents
Pre-Installation Guidelines..............................................................................................................................................................2
Installation ...................................................................................................................................................................................2-8
• Clearances Required Between Fire Damper Sleeves and Wall/Floor Openings............................................................ 2
• Sleeve Length and Wall Thickness .............................................................. .................................................................3
• Duct to Sleeve Connections ......................................................................... .................................................................5
• Securing the Damper/Sleeve Assembly to Wall and Floor Openings ....................................................... .....................5
• Installing Multiple Damper Section Assemblies ...........................................................................................................6
• Recommended Preparation of Openings in Wood and Metal Stud Walls ........................................................... ...........8
• Breakaway Connections .................................................................... ...........................................................................7
Pre-Installation Guidelines
The basic intent of a proper installation is to secure the
fire damper in, not to, the opening in such a manner as
to prevent distortion and disruption of damper operation.
This is accomplished by allowing the fire damper in rated
separation openings to expand and for the connecting
duct to separate in the event of the collapse of the hanging
system. The following items will aid in completing the
damper installation in a timely and effective manner.
1) Check the schedules for proper damper locations
within the building. Visually inspect the damper for
damage and verify that the fusible link is in place or
has not activated. Never install a fire damper without
the proper UL approved fusible link in place. If damper
is furnished with fusible link, visually inspect the link
to verify its not missing or broken. Replace link as
necessary.
2) Lift or handle damper using sleeve or frame. Do not lift
damper using blades.
3) Damper has label on outside of sleeve indicating a
‘No Screw’ area. Do not install screws into this area as
screws may interfere with unexposed blade linkage and
prevent damper blades from opening and/or closing.
4) Damper has label indicating position of damper
and sleeve assembly in the wall. Install accordingly
to comply with manufacturer’s appropriate UL
Classification file number.
5) Damper must be installed into duct or opening square
and free of twist or other misalignment. Damper
must not be squeezed or stretched into duct or
opening. Out of square, racked, twisted or misaligned
installations can cause excessive leakage and/or torque
requirements to exceed damper/actuator design.
6) Damper must be kept clean and protected from dirt,
dust and other foreign materials prior to and after
installation. Examples of such foreign materials include
but are not limited to:
a) Mortar dust
b) Drywall dust
c) Firesafing materials
d) Wall texture
e) Paint overspray
7) Damper should be sufficiently covered as to prevent
overspray if wall texturing or spray painting will be
performed within 5 feet of the damper. Excessive dirt
or foreign material deposits on damper can cause
excessive leakage and/or torque requirements to exceed
damper/actuator design.
8) Caulking is not necessary, nor is it allowed, between the
damper sleeve and the wall or floor opening (annular
space). However, caulking may be applied to the
retaining angles.
9) ACCESS: Suitable access (such that fusible links can
be maintained, etc.) must be provided for damper
inspection and servicing. Where it is not possible to
achieve sufficient size access, it will be necessary to
install a removable section of duct. (Refer to NFPA 90A).
10) The Code Authority Having Jurisdiction (AHJ) must
evaluate and provide approval of final installation where
variations to these instructions are necessary.
1. CLEARANCES REQUIRED BETWEEN FIRE
DAMPER SLEEVES AND WALL/FLOOR
OPENINGS
Fire damper and sleeve assemblies expand during
periods of intense heat. Therefore it is essential that
openings in walls or floors be larger than the fire damper
and sleeve assembly to allow for this expansion.
Minimum clearances required between the outside of fire
damper sleeve assemblies and wall/floor openings are:
• Galvanized steel fire dampers and sleeves: 1/8 in.
(3mm) per foot of damper width and 1/8 in. (3mm) per
foot height with a minimum clearance of ¼ in. (6mm)
Recommended clearances, for width and/or height
dimensions of:
1) 48 in. (1219mm) or less: ½ in. (13mm) clearance
2) More than 48 in. (1219mm) and 96 in. (2438mm)
or less: 1 in. (25mm) clearance
2
3) More than 96 in. (2438mm): 1 ½ in. (38mm)
clearance
• Stainless steel fire dampers and stainless steel or
galvanized sleeves: 3/16 in. (4.8mm) per foot of damper
width and height with a minimum clearance of ¼ in.
(6mm), maximum of 2 in. (51mm). Recommended
clearances, for width and/or height dimensions of:
1) 48 in. (1219mm) or less: ¾ in. (19mm) clearance
2) More than 48 in. (1219mm) and 96 in. (2438mm) or
less: 1
½ in. (38mm) clearance
3) More than 96 in. (2438mm): 2 in. (51mm)
clearance
These are total clearances (ignoring fastener heads)
and do not need to be equally spaced around the
damper. Refer to Section 4 and Figure 6 for additional
installation considerations.
Page 3
Damper
1/4 in. minimum
total clearance
(See Section 1)
See
Section 2
See
Section 2
Wall or floor
Wall or floor
Wall or floor
Damper
Damper
Duct
Duct
Duct
Retaining Angles
(See Section 4)
Sleeve
(See Sections 2 & 3)
Sleeve
Sleeve
On types R & CR factory
furnished duct collar
qualifies as breakaway
conneciton (See Section 5)
1 in. min.
overlap
Four sides
Mounting Angles
(See Para. 4)
1/4 in. minimum
total clearance
(See Para. 1)
Retaining angle leg
shall not exceed 7 in.
(178mm)
Example: A 12 in. x 12 in. (305mm x 305mm) damper would re-
quire a minimum clearance of 1/4 in. (6mm) on width
and 1/4 in. (6mm) on height
A 48 in. x 12 in. (1219mm x 305mm) damper would
require a minimum clearance of 1/2 in. (13mm) on
width and 1/4 in. (6mm) on height.
2. GAUGES AND LENGTHS OF FIRE DAMPER
SLEEVES
All fire dampers must be installed in a steel sleeve of
the required gauge and length. See Table 1 for required
minimum sleeve gauges. Maximum sleeve thickness is
10 gauge (3.5mm). Sleeve inside dimensions must equal
damper outside dimensions.
Sleeves shall extend a maximum of 6 in. (152mm)
beyond the wall or floor opening on each side ( see
Figure 1). When an access door is incorporated as a
part of sleeve, the sleeve may extend a maximum of
16 in. (406mm) beyond the wall or floor opening on the
access door side.
Sleeve Gauge Duct Dimension
14 ga. (0.075 in.)
- 10 ga. (0.138
in.)
[2mm - 3.5mm]
16 ga. (0.060 in.)
[1.5mm]
16 ga. (0.060 in.)
[1.5mm]
18 ga. (0.048 in.)
[1.2mm]
20 ga. (0.036 in.)
[0.9mm]
22 ga. (.030 in.)
[0.76mm]
24 ga. (0.024)
[0.6mm]
26 ga. (0.018 in.)
[0.46mm]
Sleeve thickness must not be less than the gauge of the connecting duct.
UL Standard 555 requires all ducts to terminate at fire damper sleeves.
All duct sizes
36 in. (914mm) max. width
24 in. (610mm) max. width
24 in. (610mm) diameter
All duct sizes
85 in. (2159mm) wide and
over
55 in. - 84 in. wide
(1397mm - 2134mm)
31 in. - 54 in. wide
(787mm - 1372mm)
13 in. - 30 in. wide
(330mm - 762mm)
12 in. wide and under
(305mm)
Type of Duct
to Sleeve
Connection
Permitted
Rigid or
Breakaway
Rigid or
Breakaway
Breakaway only
Vertical mount without
factory mounted sleeve
Type A
Type B
Table 1: Minimum sleeve thickness for fire dampers.
Type C, CO, CR & R
When dampers installed vertically, the
blade stack must be on the top..
Figure 1
3
Page 4
1/4 in. minimum
total clearance
Wall or Floor
Maximum
6 in.
Maximum
6 in.
Duct
Duct
Damper
Damper
Wall or Floor
Retaining Angles
(See Section 3)
Type A
Type B
On types R, CO & CR factory
1/4 in. minimum
total clearance
Wall or Floor
Maximum
6 in.
Maximum
6 in.
Damper
Type A
Type A
Horizontal mount without factory
Type B2
Type B2
Wall or floor
Damper
Sleeve
mounted sleeve
Vertical mount with factory
mounted sleeve
1/4 in. minimum
total clearance
Horizontal mount with factory
mounted sleeve
See Section 2
See Section 2
See Section 2
See Section 2
Damper
Damper
“K” side
“K” side
Type B
Retaining Angles
(See Section 4)
Wall or
Floor
Sleeve
(see sections 2 & 3)
Duct
Retaining angles
(See Section 4)
Sleeve
(See Sections 2 & 3)
Duct
Wall or
Floor
Maximum
6 in.
Duct
Retaining Angles
(See Section 3)
Duct
Type A
Type B
Wall or Floor
Maximum
6 in.
Damper
Wall or Floor
Damper
Damper
See Section 2
See Section 2
See Section 2
See Section 2
Damper
Damper
“K” side
Type A
“K” side
Type B
Retaining Angles
(See Section 4)
Sleeve
(see sections 2 & 3)
Duct
Retaining Angles
(See Section 4)
Sleeve
(see sections 2 & 3)
Damper
Duct
Wall or
Floor
Wall or
Floor
On types R & CR
factory furnished
duct collar qualifies as breakaway
connection, see
Section 5
When dampers installed horizontally,
the ramp must be positioned up as
Figure 1
4
“K” side
Type C, CO, CR, & R
shown in above drawings.
Duct
Sleeve
Wall or
floor
Wall or floor
furnished duct collar
qualifies as breakaway
connection.
Wall or Floor
Duct
Type C, CO, CR, & R
When dampers installed vertically, the
blade stack must be on the top.
Sleeve
Damper
On types R & CR factory
furnished duct collar qualifies
as breakaway connection, see
Section 5
When dampers installed horizontally,
the ramp must be positioned up as
Type B2
“K” side
Type C, CO, CR, & R
Sleeve
Duct
shown in above drawings.
Wall or floor
Sleeve
Wall or
floor
Page 5
3. ATTACHING FIRE DAMPERS TO SLEEVES
Fire dampers must be attached to sleeves as shown in
Figure 3. All four sides of the damper frame must be
attached to the sleeve with one row of attachments on
each side of the blade channel. Attachments must be
spaced a maximum of 6 in. (152mm) on centers and a
maximum of 2 in. (51mm) from corners. A minimum of 4
attachments (2 on each side of the blade channel ) per
side (16 per damper) are required. One of the methods of
attachment shown below must be used.
• tack or spot welds
• #10 sheet metal screws
1
•
in. (6mm) bolts and nuts
/4
3
•
in. (4.7mm) steel pop rivets
/16
4. SECURING FIRE DAMPER AND SLEEVES TO
WALL AND FLOOR OPENINGS.
The fire damper must be installed such that the
centerline of the blades are mounted in the plane of the
wall or floor.
Fire damper and sleeve assemblies must be installed in
wall and floor openings using retaining angles on each
side of the wall or floor as described below:
• Retaining angles for 1½ hour rated dampers with a
width and height 48 in. (1219mm) or less must be a
minimum of 20 ga. (1mm). Retaining angles for all
3 hour rated dampers and all dampers with a width
or height greater than 48 in. (1219mm) must be a
minimum of 16 gauge (1.5mm). The leg of the retaining
angle on the damper sleeve shall be a minimum of
1¼ in. (32mm). The leg of the retaining angle on the
wall/floor shall be long enough to cover the annular
space and overlap the wall/floor by a minimum of 1 in.
(25mm). (See Figure 4). Retaining angle legs may be
reversed with leg of retaining angle with annular space
of opening so angle and sleeve is flush against barrier.
• Retaining angles must be attached to the sleeve using
the procedures and methods described in Section
3. The angles must be attached to all 4 sides of the
sleeve with butt joints at each corner. A minimum of
two attachments are required on each side, top and
bottom. The angles need not be attached to each
other at the corners.
• Retaining angles should not be fastened to the wall/
floor material. The angles should only sandwich the
wall/floor and allow for damper/sleeve expansion
during periods of intense heat.
For single retaining angle applications, see Single Side
Retaining Angle Supplement (#474015).
No Connecting Duct or Transfer Opening
Openings where duct does not attach on either side will not
require a breakaway connection. Transfer openings are
typical of a non-ducted installation (see Figure 2).
• Sleeve may end flush with the rated wall/floor on both
sides
• Refer to Section 4 for securing retaining angles to
sleeves.
5. CONNECTING DUCTS TO FIRE DAMPER SLEEVE
Any duct connection other than breakaway is considered
rigid. The connections shown on this page are
considered breakaway. Factory furnished duct collars
on type R and CR fire dampers are also considered
breakaway (see Figure 1).
Figure 2 Transfer opening or no connecting duct
Attachments--Do not place attachments between blade channels
NOTE: Attachments must not enter blade
channel or they may cause interference with
Blade
Channel
2 in. Max.
6 in. Max.
blade closure. Narrow Line and Ultra Thin
dampers do not have flange for attachments
and must be welded to sleeve.
Attachments can be
staggered or evenly
spaced.
Figure 3: Field attachment of fire dampers to sleeves.
Wall or Floor
Min. 1 in.
Damper
overlay*
Retaining
angle
Sleeve
Retaining
Angle
2 in. Max.
6 in. Max.
6 in. Max.
2 in. Max.
Duct
Figure 4: Retaining angle installation.
5
Page 6
Drive Slip Joint
6. MULTIPLE SECTION FIRE DAMPERS
When multiple sections are shipped unassembled, installer shall fasten dampers together as described in Section 3.
Table 2 shows maximum sizes for multiple section dampers. Dampers that are two or more sections tall must be factory
assembled.
Damper Model Mounting
FD-100 , FD-300, FD-310, SSFD-350 Vertical 48 X 48 (1219mm x 1219mm) -
FD-150 Vertical or Horizontal 48 X 48 (1219mm x 1219mm)
FD-110 Vertical or Horizontal 48 x 48 (1219mm x 1219mm) 96 x 48 (2438mm x 1219mm)
Vertical 48 X 48 (1219mm x 1219mm)
SSFD-150
Horizontal 36 x 36 (914mm x 914mm) -
Maximum Single
Section Damper Sizes*
Maximum Multi-Section
Damper Sizes*
96 x 48 (2438mm x 1219mm) or
120 x 40 (3048mm x 1016mm)
96 X 48 (2438mm x 1219mm) or
120 X 40 (3048mm x 1016mm)
FD-350
KFD-150 Vertical or Horizontal 36 x 16 (914mm x 406mm)
KFD-110 Vertical or Horizontal 36 x 16 (914mm x 406mm) 96 x 48 (2438mm x 1219mm)
SSKFD-150 Vertical 36 x 16 (914mm x 406mm)
KFD-350
SSKFD-350 Vertical 36 x 16 (914mm x 406mm) -
DFD-150, DFD-110
DFD-350
DFD-310
SSDFD-110, SSDFD-150. SSDFD-350 Vertical 30 x 30 (762mm x 762mm) -
Note: All dimensions shown are in inches (W x H).
* Sizes listed is the damper size not transition size.
Table 2: Maximum section sizes and overall sizes for multiple section dampers (W x H).
Vertical 48 x 48 (1219mm x 1219mm) -
Horizontal 40 x 40 (1016mm x 1016mm) 80 x 40 (2032mm x 1016mm)
96 x 48 (2438mm x 1219mm) or
120 x 40 (3048mm x 1016mm)
96 X 48 (2438mm x 1219mm) or
120 X 40 (3048mm x 1016mm)
Vertical 36 x 16 (914mm x 406mm) -
Horizontal 36 x 16 (914mm x 406mm) 80 x 40 (2032mm x 1016mm)
Vertical 36 x 36 (914mm x 914mm)
Horizontal
Vertical 36 x 36 (914mm x 914mm) -
Horizontal
Vertical 36 x 36 (914mm x 914mm) -
Horizontal 30 x 30 (762mm x 762mm) -
24 x 18 (610mm x 457mm) 48 x 36 (1217mm x 914mm)
30 x 30 (762mm x 762mm) -
24 x 18 (610mm x 457mm) 48 x 36 (1217mm x 914mm)
30 x 30 (762mm x 762mm)
72 x 48 (1828mm x 1219mm) or
60 x 60 (1524mm x 1524mm) or
120 x 30 (3048mm x 762mm)
DUCT-SLEEVE CONNECTIONS
Traditional Breakaway Style Transverse Joints
Transverse joints illustrated in Figure 5 have always been
approved as breakaway connections. SMACNA testing
has also approved the following variations as breakaway
connections.
• The breakaway connections shown to the right can be
applied with maximum of (2) #10 sheet metal screws on
each side and on the bottom located in the center of the
slip pocket and penetrating both sides of the slip pocket.
• Transverse joints illustrated can
be applied as top and bottom
joints with Drive Slip - side joints
in duct heights up to 20 inches
(508mm).
6
Plain “S” Slip Hemmed “S” Slip Double “S” Slip
Inside Slip Joint Standing “S” Standing “S” (Alt.)
Standing “S” (Alt.) Standing “S” Standing “S”
(Bar Reinforced) (Angle Reinforced)
Figure 5: Traditional breakaway style transverse
joints.
Page 7
Sleeve
6 in.
Std. Clip
Length
60 in. Duct
4 Req’d.
48 in. Duct
3 Req’d.
36 in. Duct
3 Req’d.
24 in. Duct
2 Req’d.
Clip Spacing
6 in. 6 in.
9 in.
7 in.7 in.
5 in. 5 in.
5 in.5 in.
DUCT-SLEEVE CONNECTIONS cont...
Metal Stud Construction
Gypsum Wallboard
Retaining
Angle
Stud or Runner
1in. (25mm) minimum
Damper
Sleeve
In metal stud construction,
exposed steel surfaces need
not be covered with gypsum
wallboard.
Round and Oval Duct Breakaway Connections
Round ducts connected to factory supplied Type R or CR
damper collars may use #10 sheet metal screws as follows:
• Ducts 22 in. (559mm) wide (or dia.) and smaller may use
3 screws.
• Ducts larger than 22 in. (559mm) wide (or dia.) may use
5 screws.
NOTE: All breakaway connections described may have
duct sealant applied, PA2084T duct sealant adhesive
manufactured by Precision or DP1010 water base duct
sealant by Design Polymetrics, Grey Pookie, or Ductmate
PROseal®, or CL Ward S Seal in accordance with SMACNA
recommendations.
Manufactured Flanged System Breakaway
Connections
Flanged connection systems manufactured by Ductmate,
DuroDyne, Ward, Nexus, and Radiant T-35 are approved
as breakaway connections when installed as illustrated in
Figure 6.
Fire Damper Sleeve
6 in. long metal cleat or 1/16 in.
max. thickness plastic cleat;
12 in. c-c (min. 1 per side)
Flanged system angles
(Attach per
manufacturer's
instructions)
3/8 in. bolts in
corners are optional
Neoprene or Butyl gasket
between all angles
Duct
Figure 6: Detail of manufactured flanged system
breakaway connections.
Proprietary Flange System Breakaway
Connections
(TDC by Lockformer, TDF by Engle)
TDC and TDF systems are approved as breakaway connections when installed as described in the SMACNA Duct
Construction Standards. Standard 6 in. (152mm) metal clip
may be used with spacing as shown in Figure 7. Threeeighths in. (9.5mm) metal bolts and nuts may be used to
fasten together corner pieces.
Duct
Typical TDC/TDF joint
Figure 7: Detail of proprietary flanged system
Clip Spacing
60 in. Duct
4 Req’d.
48 in. Duct
3 Req’d.
36 in. Duct
3 Req’d.
6 in.
5 in. 5 in.
24 in. Duct
2 Req’d.
18 in. Duct &
Smaller
1 Req’d.
Std. Clip
Length
6 in. 6 in.
breakaway connections.
C
Duct
9 in.
7 in.7 in.
5 in.5 in.
L
Preparation of Openings in Wood and Metal Stud Walls
• Frame wall openings as shown in Figure 8 & 8A.
• Gypsum wall board must be fastened 12 in. (305mm) on center to all stud and runner flanges surrounding opening (see
Figure 8 & 8A).
• Prepare opening between studs and sleeve assembly as shown (see. Figure 9).
• All construction and fasteners must meet the requirements of the appropriate wall design. (See UL Fire Resistance
Directory)
Metal Stud Construction
Gypsum Wallboard
Wooden Stud Construction
Gypsum Wallboard
Retaining
Angle
Damper
Sleeve
Figure 9: Detail of retaining angles and gypsum board application for metal and wooden stud construction.
Stud or Runner
In metal stud construction,
exposed steel surfaces need
not be covered with gypsum
wallboard.
1in. (25mm) minimum
Stud or Runner
Retaining
Angle
1in. (25mm) minimum
Damper
Sleeve
In wood stud construction,
gypsum wallboard must cover
all wood stud surfaces.
7
Page 8
24 in. o.c.
Maximum
12 in.
24 in. o.c.
Maximum
(metal studs)
24 in. o.c.
Maximum
(metal studs)
Ceiling Runner
Second set of studs are not required on openings
36 in. x 36 in. (914mm x 914mm) or smaller.
2 Panhead
Screws
Floor Runner
16 in. o.c.
Maximum
(wood studs)
16 in. o.c.
(wood studs)
Figure 8: Preparation detail for opening in stud wall.
2 in. (51mm)
2 in. (51mm)
Maximum
Metal stud only
Figure 8A
Damper Maintenance
Dampers shall be maintained, cycled, and tested in intervals as stated in the latest editions of NFPA 90A, 92A, and UL
864 unless local codes require more frequent inspections.
Dampers do not typically require maintenance as long as they are kept dry and clean. If cleaning is necessary, use mild
detergents or solvents. If lubrication is desired, do not use oil-based lubricants or any other lubricants that attract contaminant’s such as dust.
Damper Trouble Shooting
The following is a cause and correction list for common concerns with the dampers.
Symptom Possible Cause Corrective Action
Frame is 'racked' causing blades to
bind on jamb
Damper does not fully open and/or
fully close
Screws in damper linkage Locate screws and remove
Contaminant's on damper Clean with a non-oil based solvent
Link separated Heat Replace link
Adjust frame such that it is square
and plumb
(see Damper Maintenance)
Our Commitment
As a result of our commitment to continuous improvement, Greenheck reserves the right to change specifications without notice.
Specific Greenheck product warranties are located on greenheck.com within the product area tabs and in
the Library under Warranties.
®
Phone: (715) 359-6171 • Fax: (715) 355-2399 • E-mail: gfcinfo@greenheck.com • Website: www.greenheck.com
452763• DFD, FD, SSDFD Series Rev. 21, June 2015 Copyright 2015 © Greenheck Fan Corporation
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