Carnes ETWA User Manual
CARNES COMPANY 448 S. Main St., P. O. Box 930040, Verona, WI 53593-0040 Phone: (608)845-6411 Fax: (608)845-6504 www.carnes.com
COPYRIGHT © 2012 CARNES COMPANY
ALL RIGHTS RESERVED
40071, pg 1
SPECIFICATION SHEET
Low Leakage Smoke Damper, Class II
Model ETWA - Crimped (3V) Blade
Tag Qty.
Size
Variations
Width Height
Project Location
Arch./Engr. Contractor
Representative Date
t Application and Design
The Model ETWA is a UL/ULC listed and labeled Class
II leakage rated Smoke Damper. Blades are of the 3V
shaped or crimped design. The damper is approved for
airflow in either direction and provides a maximum leakage of 20 cfm/sq. ft. at 4” w.c. s.p. It has been designed
to be installed in a vertical or horizontal mounting position in the ductwork or a separate sleeve within 24” of the
smoke partition. These dampers are approved for use in
engineered smoke control systems and are controlled
via smoke detection system. Electric (24v, 120v and
230v) or pneumatic actuators are used to operate the
smoke dampers.
Standard Construction:
Frame: 5” roll formed galvanized steel hat-section with
staked corners and integral bracing
Blades: 16 ga. roll formed, galvanized steel, 3V blade
design, min. width 4.250”, max. width 7.250”
Bearings: bronze oilite, press-fit into frame
Axles: square, plated steel
Seals: pressure sensitive 450°F silicone blade edge
seals and flexible metal jamb seals
Linkage: concealed in frame, linkage bars are .125”
Designed and tested in accordance to standards: UL 555S, ULC
S112.1. Labeled and listed by UL/ULC under File # R26359.
They meet all the NFPA 90A, IBC Code and other major code
requirements for Smoke Dampers.
Options:
Factory Sleeve
Electric Actuator
Pneumatic Actuator, 25 psi
Remote Control Box (EXRA)
Retaining Angles Smoke Detector
One Side Ionization
Both Sides Photoelectric
Mounting
Horizontal Vertical
Notes:
• Non-sleeved dampers with side plate are furnished
approximately 1/4” smaller than given duct dimensions.
Sleeved dampers are furnished approximately same
size as given duct dimensions, unless otherwise noted.
• Not recommended with blades running vertically.
5”
(127mm)
H
W
UL 555S CLASSIFIED AT
250°F OR 350°F DEPENDING
UPON MOTOR/OPERATOR
Manufacturer’s Recommendations
All moving parts of the damper must be inspected and cycled at intervals not greater than every 12 months or in
accordance with the latest of NFPA 90A, 92A, local codes and the actuator manufacturer. In addition, the damper shall be
removed and inspected for corrosion. Dry lubricants are recommended.
Standard Sizes (duct)
Min. V or H
Max. Single Section Max. Multiple Assembly
6”W x 6”H
152mm x 152mm
36”W x 48”H
914mm x 1219mm
144”W x 96”H
3657mm x 2438mm
40071, pg 2
PERFORMANCE DATA
Pressure drop testing was done by an independent laboratory to the AMCA Standard 500-D, Fig. 5.3
ductwork upstream and downstream.
DAMPER SIZE 36 x 36
VELOCITY THROUGH FACE AREA
PRESSURE DROP - INCHES OF WATER (In. W.C.)
1.0
.9
.8
.7
.6
.5
.4
.3
.25
.2
.15
.1
.09
.08
.07
.06
.05
.04
.03
.025
.02
.015
.01
100
1000
150 200 300 400 500 700 900 1500 2000 3000 4000
6000
DAMPER SIZE 24 x 24
VELOCITY THROUGH FACE AREA
PRESSURE DROP - INCHES OF WATER (In. W.C.)
1.0
.9
.8
.7
.6
.5
.4
.3
.25
.2
.15
.1
.09
.08
.07
.06
.05
.04
.03
.025
.02
.015
.01
100
1000
150 200 300 400 500 700 900 1500 2000 3000 4000 6000
DAMPER SIZE 12 x 12
VELOCITY THROUGH FACE AREA
PRESSURE DROP - INCHES OF WATER (In. W.C.)
1.0
.9
.8
.7
.6
.5
.4
.3
.25
.2
.15
.1
.09
.08
.07
.06
.05
.04
.03
.025
.02
.015
.01
100
1000
150 200 300 400 500 700 900 1500 2000
3000 4000 6000
Model ETWA - Low Leakage Smoke Damper, Class II Rated
Crimped (3V) Blade
UL 555S Classified and ULC S112.1 Listed
1.5
2.0
2.5
1.5
2.0
2.5
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