17140-A, pg 2
Specification
Furnish and install louver as hereinafter specified where shown on
plans or as described in schedules. Louver shall possess stationary vertical blades designed to prevent the penetration of wind driven rain. Louver blades shall be placed on 1.5” centers within a 6”
deep frame. Louver components (heads, jambs, and blades) shall
be factory assembled by Carnes. Louver sizes too large for shipping shall be built up by the contractor from factory assembled louver sections to provide overall sizes required. Louver design shall
limit span between visible mullions to 5 ft. and shall withstand a
wind load of 25 lbs. per sq. ft. (.86kpa)(equivalent of a 100 mph
wind [145 kph] - specifier may substitute any loading required).
Louver shall meet the performance requirements
established by the AMCA 500L test procedure and shall be
licensed to bear the AMCA certified rating seal for air performance
and wind driven rain at 29 mph and 50 mph. Louver shall have a
minimum free area of 6.82 sq. ft. based on the standard 48” x 48”
test specimen. Louver shall have a maximum static pressure drop
of .102” (intake and exhaust) water gage based on 1000 FPM free
area intake velocity. Louver shall carry a class A water penetration
classification based on a ventilation core of 689 FPM at a rainfall
rate of 3” per hour and a 29 mph simulated wind velocity. Louver
shall carry a class A water penetration classification based on a
ventilation core velocity of 689 FPM at a rainfall rate of 8” per hour
and a 50 mph simulated wind velocity.
75 mm/h (3 in/h) Rainfall &
13 m/s (29 mph) Wind Velocity
Ventilation Air Core
Velocity m/s (fpm)
Water Penetration
Effectiveness %
*Water Penetration
Classification
0.0 (0) 100.0 A
0.5 (98) 100.0 A
1.0 (197) 100.0 A
1.5 (295) 100.0 A
2.0 (394) 100.0 A
2.5 (492) 100.0 A
3.0 (591) 100.0 A
3.5 (689) 100.0 A
* AMCA Classes for maximum allowable water penetrations
200 mm/h (8 in/h) Rainfall &
32 m/s (50 mph) Wind Velocity
Ventilation Air Core
Velocity m/s (fpm)
Water Penetration
Effectiveness %
*Water Penetration
Classification
0.0 (0) 100.0 A
0.5 (98) 100.0 A
1.0 (197) 100.0 A
1.5 (295) 100.0 A
2.0 (394) 100.0 A
2.5 (492) 100.0 A
3.0 (591) 100.0 A
3.5 (689) 100.0 A
* AMCA Classes for maximum allowable water penetrations
* Discharge Loss Intake
Wind Velocity (mph) Class
29 2
50 2
Class Discharge Loss Coefficient
1 0.4 and above
2 0.3 to 0.399
3 0.2 to 0.299
4 .0199 and below
* Discharge loss coefficient is the theoretical
air flow of an opening divided by the actual
flow rate of a louver the same size.
(the higher the coefficient, the less resistance to airflow)
Wind Driven Rain Penetration Classes
Class Effectiveness
A 1 to 0.99
B 0.989 to 0.95
C 0.949 to 0.80
D Below 0.8
Wind Driven Rain Performance
AMCA 500-L
Test Size 1m x 1m (39” x 39”) core
Pressure Drop
Static Pressure Drop (inches w.g.)
FREE AREA VELOCITY (FT/MIN)
Standard air - .075 lbs per cu ft
Ratings do not include the effects of a wire birdscreen
Test based on a 48” x 48” test size
The Carnes Company certifies
that the model FRVB/FSVB
louver shown herein is licensed
to bear the AMCA Seal. The
ratings shown are based on
tests and procedures performed in accordance with
AMCA Publication 511 and
comply with the requirements
of the AMCA Certified Ratings
Program. The AMCA Certified
Ratings Seal applies to air performance ratings and wind
driven rain ratings.