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A facade of 200 m\( ^2 \) gross wall area carrying 70 m\( ^2 \) of glazing has a window to wall ratio of

  • A.28 per cent
  • B.3.5 per cent
  • C.35 per cent
  • D.70 per cent

Answer: C

Correct answer: 35 per cent

\[ \frac{70}{200} = 0.35. \] Thirty-five per cent is a moderate figure for a commercial facade. It is taken against the gross wall area including the glazing, so dividing by the opaque area alone would give 54 per cent - a different quantity and not the one the codes define.

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