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External Venetian Blinds


External venetian blinds offer a flexible and highly effective sun and sight screen solution.  Out door blinds and venetian blinds ensure optimum indoor climate and comfort - including options for blackout.

Thermosash has partnered with Hella, an Austrian company that has vast experience and leads the market in high quality façade blinds, outdoor blinds, exterior roller shutter systems including full automation of their systems. Thermosash  has sourced this product due to the very high quality of their systems, vast product range, silent operation and ability to integrate with our façade systems seamlessly.

Hella's unique engineering and design, simple fully automated or manually operated remote systems (can be operated via your smartphone) allows the heat to be reflected away from a building façade before it has to be managed internally by mechanical air conditioning plant. External blinds can also manage glare whilst not reducing natural light transmittance.

Externally Mounted Venetian Blinds - are fully weatherproof and automatically lower when the light sensor detects light levels of a predetermined level. By programming or from remote operation, can fully close if desired or tilt to your preferred angle. The blinds will automatically retract when the light levels drop below this level and if wind levels exceed the design rating for the selected system. There are blinds which operate down tensioned stainless steel cables or more robust versions which slide inside a recess-able jamb track.

Encapsulated Venetian Blinds - are often installed in twinskin curtainwalls - these units must still be externally rated blinds as they are in the 'wet zone' of a curtainwall, however due to no wind load action, the blinds can be slimmer.
Product Features

  • Control heat gain externally.
  • Control glare.
  • Manufactured from highly flexible special aluminum alloy or extruded blind section.
  • Fully automated or manually geared (individually or in groups).
  • Fitted externally with light and wind sensors.
  • Easily integrated with Thermosash curtainwall suites.
  • Small retracted package. 
  • High wind stability and durability.
  • Baked enamel blades for supreme protection.


There are many systems to select from and they must be engineered to suit your project and site location. 

External venetian blinds can single span up to 5000mm with a single drop of 5400mm offering 24m2 of blind surface.


call us to discuss your specification requirements based on your final selection.

Surface Finishing 

Polyester powdercoat  - Both standard and special colours available.
Anodised - All anodised colours available - commercial grade 20 micron finish recommended.
PVF2 Flourocarbon finishes - Available on request.

Performance / Testing

  • AS/NZS1170 (Structural Design Actions)
  • NZS4223 (Glazing in Buildings)
  • NZS/AS4284:2008 (Water / Air Pressure/ Air Leakage - Meets and exceeds minimum requirements)

Maximum Spanning Ability

Thermosash specifically engineers the best suite option for your project taking into consideration span, structural system, and environmental loads (e.g. wind). The spanning ability will vary depending on the above. 

Thermosash Suites are recognized as having the largest spanning systems on the market due to our specific engineering capability and the customised nature of the work we complete.


The standard warranty is 5 years from the date of practical completion for these products. This covers workmanship and weather tightness, providing the subcontract includes fabrication, installation and glazing of all components. 

Downloads Available 
Please go to our resource section or click below for the relevant downloads to your project:

NB: Louvres and blinds etc are treated as an engineered accessory.
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