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Exterior Suncontrolers
Have Best Shading Coefficient

Shading Coefficient
         
Sun Shading System   Blade Color   Shading Coefficient
Exterior Venetian blinds 45 open (no direct admission of sun rays)   Light
Dark
  0.15/0.25
These values can be improved by tighter closing of blinds
         

Research work confirms the practical experience:

Retractable sun shading placed in front of the window such as exterior Venetian Blinds and operable sun control devices achieve the most effective results.

** See Test Report "Effect of Color on surface Temperature of Facades and Exterior Venetian Blinds-Temperature Data"