Example: To select a louvre to exhaust 0.595m³/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. 4.3 m/s.

WPL50 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 = 0.595 (m³/s)/4.3 (m/s) = 0.13 (m²)

Step Three: Select a suitable louvre from the Free Area (m²) table. Some suitable louvres from the Free Area Table are:

• 0.500m wide x 0.800m high
• 0.600m wide x 0.700m high
• 0.300m wide x 1.400m high
• 0.450m wide x 0.900m high

 
 
Ventilation Solutions from Osborne-Hume Grilles & Louvres Ltd
Control Condensation, Humidity & Mildew

Phone:		+64 (9) 527 4425
Fax:		+64 (9) 527 4426
Email:
Enquiries:		General Enquiry Form
Address:		29a Hannigan Drive, St Johns, Auckland 1072, New Zealand

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