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Introduction When looking to shade the window or a façade of a building with an external blind, a common question is: Which option to choose, the external venetian blind or the retractable material blind? The answer to this question is a straightforward mix of logical thinking, personal preferences and the consideration of a number of variables which includes: motivation, privacy, climate and cost. Motivation Understanding why is the blind required and what is it required to do? Is a great starting point in decision making process. In Western Australia external blinds are primarily used as a tool for solar control. Consequently, the energy transmission qualities of each option is an important consideration. For example, an aluminium slat of an external …