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Double Bank Louvre

Double bank louvre is the minimum requirement for providing weather louvre and performance louvre for rain defense.

Where ventilation and a good level of rain defence is required, double stage louvres are the answer. The louvres can be extruded in lengths up to 6m long in the Architectural Line and are available in 50mm or 75mm blade spacing.

BladeAirflow velocity in m/sAirflow


ModelBlade Spacing (mm)Blade Depth (mm)Blade ConfigurationFront Blade OrientationRear Blade OrientationSupport Mullions

Double stage 66

For more detailed information on how the Sterling Casement Ventilator is a good fit for you, click on the links provided below.



High grade extruded aluminium to grade 6063 T5 and T6. Tensile strength of 152 – 300MPa.


Anodised, polyester power or PVDF coatings

Rain Defence

More than 99% efficient, Class A rain defence classification up to wind speed of 2.0m/s. Allowing less than 0.75l/hr/m2 of water through the louvre using 50mm blade spacing.


Class 2 airflow coefficient of 0.291 with 50mm

Span Table

Maximum mullion centres of 1.25m for wind load up to 5kPa.

Up to 1.5m for wind load up to 2kPa.

Learn More

For Further Reference please read the documents provided below. If you wish to obtain further information regarding our Ventilation Systems, please contact us at (02) 9526 3100, or email us at

Alternatively, you can speak to us in person at Greene Fire Pty Limited, Unit 2 7-11 Parrawareena Road Taren Point, NSW 2229


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