Weather Resistant Louvres
Osborne-Hume Grilles & Louvres

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Louvre Models
Model WPL 100 Louvres
Model WPL 100 Closeabl Louvrese
Model WPL 100 Vertical Louvres
Model WPL 80 Louvres
WPL 50 Louvres
EXH 100 Exhaust Louvres
Water Penetration Table
Water Diverting Hoppers
Egg Crates
No Vision Door Grilles
Wall Grilles
Sun Louvres
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)

WPL80 Louvres - Performance Graph

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

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

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

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