External versus Internal Shading Systems

Many reputable studies have been conducted into the efficiency of external and internal shading systems. Research findings by Australian Institutions and summary figures are available through the CSIRO. The objective with any shading device is, of course, to keep the inside temperature in a range where our bodies feel comfortable and perform at their best. It has been well established that these temperatures range between 18o and 25o Celsius. To achieve and maintain this comfort zone we need to spend valuable energy cooling and heating our homes and workplaces.

Utilising the innate properties of aluminium, which provides high solar radiation reflection and low absorption and transmission values, the ev80 and ev93D act to effectively reduce:

  • household energy requirements.
  • carbon dioxide and greenhouse gas emissions.
  • expenditure.

Locally and environmentally, these systems maximise internal light and thermal comfort levels whilst allowing external views to be maintained.

Effectiveness of External Venetian Blinds

Assessing the impact of heat gain through glass.

Heat gains that occur within internal spaces can be classified on the basis of their origin. These may result directly from internal sources of heat or from the external environment.
Heat gains from the external environment are caused by the passage of solar radiation through mediums and structures such as walls, ceilings, glazed window surfaces, doors and the infiltration of external air. External Heat Gains have a decisive impact on the thermal load of buildings. Window design, surface area and orientation are all factors which affect this loading dramatically. External systems that also act as barriers against cold winter nights will save money in two ways:

  1. The upfront investment into a smaller heating and cooling unit.
  2. Ongoing savings in running and maintenance costs.
heat gain through glass

A - ev-Slats angled at 45 degrees
- Double glazing
C - Sun’s radiation
D - Reflection

Effective use of External Venetian Blinds

As a general rule, the ev80 and ev93D are lowered in the vertical or closed (0 degrees) position and raised in the horizontal position (90 degrees). The slats can be tilted and rotated at various angles between these parameters. This may be altered, if required, with a maximum 180 degree operating range possible for the ev80.

For Winter Use

To reduce heating energy requirements in Winter

In the space between a window and a closed external venetian blind, an air pocket forms which prevents heat from being transported outside. Buildings with unshaded windows will emit radiation towards the outside environment and experience significant energy loss as a result.

The slats act as an effective radiation shield to prevent the loss of heat. The amount of solar radiation and light entering through the glazing can also be incrementally controlled. Simply tilting the blinds allows sunlight to be focused into a room which assists with passive warming during the cooler months.

For Summer Use

To reduce cooling loads in Summer

  • Open the windows whenever the outside temperature is lower than the temperature inside the building.
  • Close the windows when the outside temperature exceeds the inside temperature.
  • If it is necessary to ventilate a room during high outside temperatures, do so briefly and
  • Use cross ventilation whenever possible.
  • Over the entire day keep the system in a closed position such that there is just enough light to eliminate the need for artificial lighting. (The visible spectrum of solar radiation contains a great deal of thermal energy which will heat up the room).
  • Adjust the slats in such a way that ideal lighting is maintained using daylight for the whole day.
  • Avoid using artificial lighting, noting that daylight provides the room with four times the brightness per watt, which in turn means that artificial lighting heats the room up to four times as much as daylight. In addition and most importantly, daylight increases people’s sense of comfort.
  • In the evening, they should be opened to enhance night-time cooling results.

ev80 & ev93D blinds have been designed to effectively:

  • Reduce solar glare and transmission

  • Contribute markedly to the reduction of heat gain through glazing

  • Provide shading and cooling in warmer months

  • Allow the passive entrance of solar radiation during colder periods

  • Reduce household energy consumption and expenditure

  • Enhance the comfort and well being of those living and working inside


Streamlined and functional, the ev80 and ev93D are capable of efficiently shading large expanses of glass whilst at the same time creating a striking facade. Their unique design means they can be operated to allow the entrance of natural light without glare, all the while maintaining exterior views.

The aluminium slats of the blinds can be either tilted to varying angles or retracted by remote control, switch operation or integration with CBUS and Building Management Systems. Incorporation of Sun and Wind Sensors means optimal operating parameters may be achieved automatically.


Ongoing product development and investment in the latest manufacturing technologies ensures we are able to provide our clients with modern, innovative solutions, engineered to benefit the evolution of building design.

The ev80 and ev93D range are available for residential, commercial and architectural applications and can be found wherever high performance shading systems are required. Both are engineered and produced at our administration and manufacturing plant located on the Mornington Peninsula. This not only ensures we can provide unique lead times, it also means that critical client support is readily available.


Each evaya Rolled Edge Aluminium Slat is:

  • Reinforced with copper free aluminium alloy to provide added strength and flexibility.
  • 0.45 mm gauge, chemically pre-treated and stove enamelled.
  • Roll Formed and Machined on our premises utilising the most advanced technology and operating systems.
  • Scratch, shock and corrosion resistant.
  • Available in a range of Standard Colours and
    Project Specific Alternatives.
  • Custom Colours available upon request.
Colorbond Colours

Precision machining punches and draws holes along the length of the slats to allow the passage and fastening of ladderbraids, Hagofixing, Texband Lifting tapes and coated stainless steel wire guides, where required.
Omega Punching, a process by which a horse shoe shaped cleft is produced at various intervals along the length of the slat, ensures correct spacing between the louvres. This facilitates both the incremental adjustment of blade angles and closure, while at the same time enhancing wind stability.
As with any colour sample or swatch, this brochure is a representation of the evaya 80C and 93D Colour Range and is meant as a guide only. Every effort has been made to present these colours as accurately as possible and as closely as modern printing processes allow. Please note that appearance may vary according to light source.
Where accuracy is vital a section of slat can be requested to confirm selection and colour match.
Please feel free to discuss alternatives with one of our representatives who will be more than happy to help you with your selection.

Nano Technology

We are fortunate to be one of the few companies globally to have unique access to titanium dioxide (Ti02) photocatalytic coil coating nano technology. Under the effect of sunlight the Ti02 acts as a catalyst and causes the decomposition of organic dirt particles.

Over time organic substances and other environmental contaminants deposit on surfaces, to which dirt and dust particles can then easily adhere. With the photocatalytically active coating, organic substances are decomposed under
irradiation by UV(A) light and transformed into carbon dioxide and water. Non-organic dirt particles adhering to coated surfaces are thus minimized.

Indirect sunlight and limited moisture are sufficient to activate the self-cleaning process. The TIO2 coating has a self- cleaning effect even on surfaces which are not directly exposed to rain. Once the coating has been activated the surface becomes hydrophyllic (attracts water). The water is then distributed evenly over the surface in a thin film. As a result the coating dries very quickly without leaving any drop marks.

The titanium dioxide contained in the coating not only contributes to cleaning the surface, but is also capable of eliminating harmful substances from the air we breathe. TiO2 is a semiconductor. UV light generates electrons on the surface, which then form oxygen radicals. Oxygen radicals break down many harmful pollutants in the air, such as nitrogen into harmless nitrate, volatile organic compounds into CO2 and water, and ozone into oxygen.

Eco-friendly and sustainable
Titanium dioxide is completely safe and environmentally friendly. The photocatalytic process is continuous, remains undiminished by UV light and does not release nanoparticles. It’s use and processing is completely harmless.


Tilting and Lifting Devices

  • Bearings: located in the 56 x 58 mm extruded aluminium head rail, enable the slats to alter angle direction smoothly and efficiently.
  • Ladderbraid : Upon which the blind slat is either rested or fastened (refer to omega punching) is woven and reinforced with Kevlar/ Aramid fibres.
  • 8mm Texband Anti-Friction UV Stable Lift Tape is utilised to raise and lower the slat bundle.
  • Omega punching of aluminium slats, a process by which a horse shoe shaped cleft is machined at various intervals along the length of the slat and through which the ladderbraid is fastened, acts to ensure the correct spacing between blades and enhances both incremental adjustment of slats and inherent wind stability of the blind. Profiles, side channels and pelmets:
  • Extruded with non-corrosive aluminium alloys.
  • Available in a range of finishes, including anodised and powder coat colours.
  • Designed and engineered by evaya.


The ‘Made by evaya’ quality is ensured with each ev80 and ev93D produced at our Manufacturing and Administration Plant located on the Mornington Peninsula. The latest innovative software, technology, equipment and high speed production lines ensures precise:

  • Roll-forming of aluminium coil.
  • Machining of material.
  • Fixation of guide elements.
  • Automated threading and stacking of slats.
  • Intelligent Production Supervision.
  • Quality Control.


The ev80 and ev93D are driven by German Engineered, market leading, Geiger GJ56 Venetian Blind Motors, a perfect combination with no compromise. These are the most innovative, practical, reliable and quietest drive solutions in their class.
The GJ56 silent motor:

  • Requires minimal energy consumption.
  • Ensures longer running times due to its
    design which prevents over heating.
  • Is manufactured with the most reliable and proven components.
  • Has the most optimal torque values of any motor of its type.


Aluminium coil coating technology is the most efficient, reliable, stable, and environmentally friendly means of applying a durable paint finish to each individual slat.

The coils we utilise in the manufacturing process are reinforced with copper free aluminium to provide added strength and flexibility. The 80c rolled edge and 93D slats are formed and machined on our premises utilising the most advanced operating systems and machinery.


Profiles, Side Channels & Pelmets

  • Extruded with non-corrosive Aluminium Alloys.
  • Available but not limited to a standard range of RAL and powder-coat colours.
  • Modern, Innovative and aimed at benefitting in the evolution of building design.
  • Environmentally Sustainable and readily recyclable.
  • Created and Engineered by evaya.
tilting and lifting

Tilting & Lifting Devices

  • The Ladderbraid, and Hagofixing, upon which the slat is either rested or fastened, is woven and reinforced with Kevlar Aramid fibres.
  • 8mm Texband Anti-Friction and UV Stable Lifting Tape is used to raise and lower the slat bundles.
  • The correct spacing between blades, enhanced incremental adjustment of blade angles and the inherent wind stability of the ev80 and ev93D is a result of a process called Omega punching, which acts to fasten the slat to the ladderbraid.
the brand

The Brand

The name evaya is an acronym of many individual elements. Like our team and product range these have been fashioned to work in perfect harmony. When you see the evaya logo you can be assured that you have become part of an organisation that is driven by solutions, performance and passion. With established clientele, we endeavour to strengthen our position in the market through continual product improvement and unique lead times, whilst ensuring critical client support is always readily available.

evaya “Australia’s Leading Manufacturer of External Venetian Blinds” | Residential | Commercial | Architectural

Further information and technical specifications relating to the ev80 and ev93D are available for download as data sheets below. If you have any queries or would like to discuss further please feel free to contact our office.

Download our latest External Venetian Brochures