Storm Louvres - Actionair

The following graph details louvre
Performance efficiency comparisons between the
Storm Louvres as manufactured by
Data Naco in comparison with typical
Z type louvres.
95
90
EFFICIENCY % 100
85
80
TYPICAL ‘Z’
LOUVRE
0 0.25 0.5 0.75 1.0 1.25 1.5 1.75 2.0 2.25 2.5 3.0 3.25 3.5 3.75
VENTILATION RATE M/S
SLH-S
The water rejection performance of The following tables detail the relevant
Type SLV Storm Louvre was 100% at classifications for the Storm Louvres
2.0m/s core velocity and remained at Types SLV, SLH and SLH-S in
99.8% at the end of the recorded test accordance with the HEVAC test /
at 3.8m/s core velocity. draft European Standard
Classification.
Weather louvres are classified by their
ability to reject simulated rain.
Water Classification
For Water Effectiveness
Class A
Class B
Class C
Class D
100% to 99%
98.9% to 95%
94.9& to 80%
Below 80%
SLH
SLV
Cd Classification (aerodynamic)
Discharge/Entry Loss Coefficient
Class 1
Class 2
Class 3
Class 4
0.4 and above
0.3 to 0.399
0.2 to 0.299
0.199 and below
Storm Louvre Type Water Class Cd Class Core Velocity
SLV
SLH
SLH
SLH
SLH-S
SLH-S
A
A
B
C
B
C
1
3
3
3
2
2
Up to 3.5m/s
Up to 1.0m/s
1.0m/s to 2.0m/s
2.0m/s to 3.0m/s
Up to 1.5m/s
1.5m/s to 2.9m/s
The above tests were carried out by BSRIA Report 1617/1 in accordance with
the HEVAC technical specification ‘Laboratory testing and rating of weather
louvres subject to simulated rain’, with a simulated rainfall of 75mm per hour
and a wind speed of 13.5m/s.
Storm Louvres
Storm Louvre
Specifications
Naco Storm Louvre SLV
Storm Louvres with vertical blades
housed in a recessed style frame of
all extruded aluminium construction
and complete with bird wire guard.
The sight proof louvres having a free
area of 43% provide A 1 test
classification up to 3.5m/s.
Single module panel Type SLV Storm
Louvres in square or rectangular
formats as available from Actionair.
Naco Storm Louvre SLH
Storm Louvres with horizontal blades
housed in a recessed style frame of
all extruded aluminium construction
and complete with bird wire guard.
The sight proof louvres having a free
area of 44% provide A 3 up to
1.0m/s, B 3 (up to 2.0m/s) and C 3
(up to 3.0m/s) test classifications.
Single module panel Type SLH Storm
Louvres in square or rectangular
formats as available from Actionair.
Naco Storm Louvre SLH-S
Storm Louvres with single design
horizontal blades housed in either a
recessed or flanged style frame of all
extruded aluminium construction and
complete with bird wire guard.
The Storm Louvres having a free area
of 44% provide B 2 (up to 1.5m/s)
and C 2 (up to 2.9m/s) test
classifications.
Single module panel Type SLH-S
Storm Louvres in square or
rectangular formats as available from
Actionair.
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