Carnes EDGA Installation Manual

FORM 40007

INSTALLATION, OPERATING AND MAINTENANCE INSTRUCTIONS

Ceiling Radiation Dampers

CAUTION! DO NOT INSTALL, USE OR OPERATE THIS EQUIPMENT UNTIL THIS

MANUAL HAS BEEN READ AND UNDERSTOOD. READ AND SAVE THESE INSTRUCTIONS FOR FUTURE USE.

These installation instructions apply to ceiling radiation dampers mounted in 3 hour rated ceiling with
supports from (1) a ceiling grid system, (2) ductwork above, or (3) structure above. Each type of
damper support system is described with damper being mounted in conjunction with various air
devices.

CEILING RADIATION DAMPER APPLICATIONS

Underwriters Laboratories (UL/ULC) labeled ceiling radiation dampers are designed to function as
a heat barrier in air handling duct outlets penetrating fire resistive membrane ceilings. They provide the
necessary protection for air inlet and outlet penetrations in assembles up to 3 hours, which are designed
incorporating a “hinged door” damper. They are intended to restore and maintain the fire resistive integri­ty of the assembly and are for use in lieu of hinged door type dampers. Our UL/ULC labeled ceiling radi­ation dampers may be substituted for hinged door type dampers in individual ceiling designs as defined
in UL’s Fire Resistance Directory. For ceiling construction, refer to the UL Fire Resistance Directory.

General Notes

: All assembly components such as hanger wires, diffuser pans, duct drops, sleeves,

and ducts shall be constructed of steel. The instructions shown in these details are of a general nature.
Actual installation must also conform to the UL Design as listed in the UL Fire Resistance Directory.
Ceiling penetrations should be located within ceiling tiles or panels without necessitating cuts in the ceil­ing suspension main runners or cross tees. If required, a maximum of one cross runner or cross tee may
be cut to enable proper damper location and installation. Each cut end shall be supported by a min. 12
SWG vertical hanger wire. Hanger wires shall not be sprayed. A 1/2” clearance must be maintained
between the opening and the cut end of the runner or cross tee. In installations where the ceiling open­ing is greater than 1” larger (in any direction) than the ceiling damper, a thermal blanket shall be used
to cover the exposed steel pan of the grille. If flex duct is used, it must be Class O or I type, bearing the
UL listing mark. All butterfly type dampers are shipped from the factory with the blades closed. Even
though one type of damper is shown in each drawing, all dampers mount in the same manner as the one
shown (See Detail A).

Connection Notes

: Attachment at locations, such as grille/damper and damper/duct, shall be min. #8 sheet metal screws, 3/16” steel

rivets, 1/4” tack welds, 1/4” nut and bolts. Fasteners for square/rectangular connections shall be a minimum of one per side spaced on
a maximum of 6” centers. Fasteners for round connections shall be a minimum of 3 evenly spaced around the diameter up to a
maximum of 6” on center. The connection of the damper and grille can be such that the damper slides over the neck of the grille or inside
the throat of the grille. While installing fasteners, take special care so they do not interfere with the operation of the damper blades. When
hanger wires are used, they must hang vertically and not be splayed, they are to be perpendicular to ceiling.

Thermal Blanket

: In those installations where the opening in the ceiling membrane is larger than the ceiling damper (more than 1” in

any dimension), a Thermal Insulating Blanket must be installed by laying over the exposed surface of the air inlet or outlet device. The
Thermal Blanket rests upon and protects exposed portions of the air device and may fit inside adjacent tee bars (if any), or overhang
the tee bar as with Model EDGA.

Fusible Link

: (Butterfly Type) Models EDAA, EDBA, EDCA, and EDDA are shipped from

the factory with the blades closed. The fusible link must be installed at time of installation
such that the blades are held open as shown at the right, Detail B. Model EDMA must have
link installed after installation to duct or structural member above (See Fig. 3).

DAMPERS SUPPORTED BY A CEILING GRID SYSTEM

Exposed tee bar ceiling grid systems often use “Lay-In” supply and return grilles. With
attention to the following requirements, the ceiling grid system provides all required sup­port for installation of “Lay-In” style ceiling dampers and the grilles. Ceiling openings up to a 24” x 24” (576 sq. in.) maximum are allow­able. Maximum size limits of each individual ceiling damper model must be observed. The four corners of the tee bar containing the air
device (or the midpoint of the adjacent cross-tees) shall be directly supported from the structural members of the floor or roof above it
by 12 SWG minimum vertical hanger wires. When the duct extends over the intersections of the grid members, 16 ga. by 1-1/2” steel
channels with 9/16” minimum flanges shall be used to ensure that the grid is supported from the structural members by 12 SWG
minimum hanger wires. All UL Classified ceiling assemblies require lay-in ceiling panels be cut to fill the remainder of hole openings
larger than 24” x 24” and shall provide a minimum of 3/8” bearing on the ceiling grid members.

LAY-IN DIFFUSER NON-DUCTED OR FLEX DUCT APPLICATIONS (Figures 1 and 1A)

Lay-in diffuser installs directly into exposed tee bar grid system.
Ceiling damper attaches to diffuser neck (See Fig. 1).
Thermal Blanket may be required (See Thermal Blanket Above).
If flexible duct is used (See General Notes Above)
it shall be fastened to the diffuser neck with a steel clamp or
#16 SWG minimum wire.
(1) The flexible air duct shall not rest on the back surface of the

ceiling grid or panels (provide a minimum of 4” clearance).

(2) The flexible air duct shall not interfere with the closing of

the ceiling damper.

FORM 40007, Page 1

CARNES COMPANY 448 S. Main St., P. O. Box 930040, Verona, WI 53593-0040 Phone: [phone] Fax: [phone] www.carnes.com

Detail A

Detail B

Figure 1

Figure 1A

3-1/2”

1

1

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FORM 40007, Page 2

For Models EDGA and EDLA (See Figure 1, Page 1)

Damper is supported directly by the grid system and may lay on top of perforated metal (or similar) grille core material. Skirt material
must overhang the tee bars around perimeter of damper.

Lay-In Diffuser with Steel Duct Drop (See Figure 2)

Lay-In Diffuser with steel duct drop installs directly into exposed tee bar grid system. Thermal Blanket is required (See Thermal Blanket
Page 1).
Connection of ceiling radiation damper, diffuser neck, and steel duct drop (See Connection Note Page 1) may be satisfied in two ways:
(1) Ceiling radiation damper and diffuser neck may be connected directly to the duct drop (See Detail C)

-OR­(2) Ceiling radiation damper may be connected directly to the diffuser neck and then the duct drop connected to the damper

(See Detail D)

ITEM DESCRIPTION

1. Grille Frame (Steel)

2. Diffuser or Grille Core (Metallic or Non-Metallic)

3. Sheet Metal Duct

4. #8 Sheet Metal Screw

5. Ceiling Radiation Damper

6. 16 MSG x 1-1/2” Channel

7. Ceiling Grid (UL Classified)

8. Duct Drop

9. 12 SWG Steel Wire

10. Acoustical Lay-In Panels (UL Classified)

11. Rigid Gypsum/Drywall Wall Board Ceiling
(UL Classified)

12. Thermal Blanket

Hinge Door Applications (Figure 3)

For Model EDMA

Ceiling radiation damper is the same size as the ceiling
opening and installs directly into the exposed tee bar grid
system opening. Damper is supported directly by the grid
system and may lay on top of perforated metal (or similar) grille
core material. Fusible Link support wire must attach to duct or
ceiling supports above.

DAMPERS SUPPORTED
BY DUCTWORK ABOVE

Note: When main ducts are supported by 16 ga. by 1-1/2” steel
channels (with 9/16” minimum flanges) located 1” to 3” from and
on both sides of a steel duct drop and these channels are
suspended by #12 SWG wire from structure above. The steel
duct drop provides all required support for ceiling damper and
grilles. Air diffuser flange must overlap the ceiling membrane by
a minimum of one inch.

Follow guidelines on Page 1 when preparing opening in the
ceiling membrane and making connections.

Detail C

Figure 2

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Detail D

3-1/2”

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See Details
C & D

Figure 3

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3-1/2”

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11

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3

8

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9

1” MIN.

Max. 85°