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A horizontal overhang is the appropriate shading device for a facade facing

  • A.east, where the morning sun is low
  • B.west, where the afternoon sun is low
  • C.north, which receives no direct sun
  • D.south, where the summer sun is high

Answer: D

Correct answer: south, where the summer sun is high

At midday in summer the sun is high in the south, so a modest projection above the window intercepts it. In winter the sun is low and passes beneath the overhang into the room, which is precisely what is wanted. The geometry does the seasonal switching with no moving parts.

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