External Shutters vs Internal Shading from Evaya

External Shutters Outperform Internal Shading Devices

Benchmarks set by the "German Industry Standard VDI" show external shutters to be outperforming internal venetian or vertical blind system.

External covers over glass areas with a northerly aspect stop over 85% of the heat whereas the internal systems allow nearly 5 times as much energy to pass.

To achieve and maintain the same temperature with internal shading devices, you need to invest twice as much into a larger cooling system.

It will cost on average 115% more to maintain and 140% more to run the larger unit.

Another important fact: In achieving these results external louvres reduce daylight only by 20%. (this figure is higher with roller shutters)

Limits of Internal Applications
To achieve similar cooling results internally the air between the glass and the internal blind needs exchanging up to 20 times per hour. In situations where the glass area is more than 65% of the total wall area satisfactory results cannot be achieved by means of internal solar control.

These results clearly favour external solar control systems. You also have the additional bonus of Security.

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4 Suffolk Street, Capel Sound, Vic, 3940.

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