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WPL 80 Louvre Selection
Weather Resistant Louvres
Example: To select a louvre to exhaust 1.0m3/s
with a pressure drop of 20Pa.
Step One: From the Performance Chart below select
the Pressure Drop of 20 Pa. Plot across to the exhaust curve.
Then plot down to the indicated free Area Velocity e.g. 4.0
m/s.
WPL80 PERFORMANCE
(Tested at Auckland Ventilation Services,
Sept 2000, test results available on request)
Step Two: Calculate the required Free Area of the
louvre.
Free Area = Volume Flow Rate/Free Area Velocity
Free Area = 1.0 (m3/s)/4.0 (m/s) = 0.25 (m2)
Step Three: Select a suitable louvre from the Free
Area (m2) table. Some suitable louvres from
the Free Area Table are:
- 2.00m wide x 0.400m high
- 0.450m wide x 1.400m high
- 0.800m wide x 0.800m high
- 0.400m wide x 1.600m high
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