Sun shading device on east and west facade

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    sepeedeh Rastegar-Panah

    the sun rays from east and west run closer to a horizontal line than a vertical therefore a horizontal overhang will just run parallel to the sun rays almost doing nothing in that situation. I don't know the context of the article you are referring to, but it doesn't sound correct to me.  

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    Rebecca Cassidy

    I also learned that vertical should be preferred over horizontal when it comes to East and West facades, so I pulled my book out to read that section. It looks like HCL promotes a "long" horizontal overhang as better than vertical because if it is long, it will block out most of the sun without obstructing the view. If you look on page 255, they illustrate a 33'-0" overhang to fully cover the window. Which is also why they promote smaller windows on the east and west side so the overhang doesn't need to be that long.

    On page 257, #7 says "If views to the east or west are not desirable, slanted vertical fins can be an alternative." Therefore, I think if you come across a question in the exam reference east west sun but nothing about views, go with the vertical fin option. If they specifically reference a view, choose long overhang or another option that allows a view without too much heat gain or glare.

     

     

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    Mitul Patel

    I am not sure what the NCARB considers a correct approach, but in practice, a well-calculated deciduous tree placement combined with horizontal fin (optional if you want to save money) shading for the most climates or tall hedge for hot and aired. Vertical fins are a joke that has gone on too long...they look bad (for the most part), need precise installation, don't work well with most cladding systems, nightmare on structure, and lost of maintenance... in my opinion, you will get better performance with Venetian blinds then vertical fins with lower maintenance costs.

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