Osbournes Grilles, Diffusers & Louvres


WPL80 Louvre Selection

A weather resistant louvre ideal for commercial ventilation applications. The WPL80 comes in a channel or flange option, with bird mesh fitted to the rear as standard.

WPL80 Performance
Tested at Auckland Ventilation Services, Sept. 2000.
Test results available on request.

WPL80 Louvres - Performance Graph

Example: To select a louvre to exhaust 1.0m3/s with a pressure drop of 20Pa.

Step One:

From the Performance Chart, 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.

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