Carnes EARA User Manual

Fire, Smoke & Ceiling Radiation Dampers

Fire Dampers

E-12 www.carnes.com

Model EARA (Static Systems), Model EHRA (Dynamic Systems)

Type A True Round Damper, Single Blade w/Integral Sleeve

UL 555 Classified 1-1/2 Hours

t Application and Design

The Model EARA and EHRA are UL Classified for
installation in walls, floors and partitions with a fire rating
of less than 3 hours. This damper may be installed
vertically or horizontally in static systems (EARA) that
shut down in the event of fire or dynamic systems
(EHRA) that continue to operate in the event of fire.

Standard Construction

:

Frame: roll formed frame, galv. steel, integral sleeve
Blades: double thickness, galvanized steel, welded
Axles: 3/8” square plated steel
Jackshaft: 1/2” diameter plated steel
Bearings: bronze oilite press-fit into frame
Spring: stainless steel
Fusible Link - UL-33: UL listed 165°F (standard),

212°F (optional)
Retaining Plates: 2-20 ga. galvanized steel with angle
clips (factory installed)

Maximum Velocity: 2000 fpm (10.2 m/s)
Maximum Pressure: 4” w.c. (1kPa)

Model EARA and EHRA meets or complies with the following as a fire
damper:
All major building codes, including IBC/ICC International Code
UL 555 Listing 1-1/2 hour - File #R25410
ULC S112
NFPA 90A, 80

Note: Dampers are furnished approx. 1/8” smaller than given duct
dimensions.

Note: The jackshaft permits operation by any standard locking
quadrant, electric or pneumatic actuator.

Options

:

 Sleeve/Damper Body 20”
 Sleeve/Damper Body 24”

 Locking Quadrant
 Actuator
 Mounting

 Horizontal
 Vertical

16”

(406mm)

1-1/2 HOUR RATING

*For use in fire barriers

rated for 2 hours or less.

Dia. + 3”

(76mm)

Dia. + 3”

(76mm)

Retaining plate

(2 supplied)

Standard Sizes (duct) 1-1/2 Hour

Min. Size Max. Size

8” Diameter

203mm

24” Diameter

610mm

Fire Dampers

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Fire, Smoke & Ceiling Radiation Dampers

Model EARA and EHRA - Type A True Round Damper

PERFORMANCE DATA

Pressure drop testing was done by an independent laboratory to the AMCA Standard 500-D, Fig. 5.3
ductwork upstream and downstream.

Leakage obtained in test of 8” diameter and 24” diameter was less than 1 CFM/sq. ft.

PRESSURE DROP

PRESSURE DROP (INCHES W.C.)

FACE VELOCITY (FPM)

8” DIAMETER

24” DIAMETER

1.00
.80

.60
.50

.40

.30

.20

.10

.08

.06
.05
.04

.03

.02

.01

100

1000 10000

2

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