For a backbone distribution system serving a usable floor space of ≈ 8,920 m2 (96,000 ft2), the MINIMUM slot area to be used for this back bone is
≈ 0.040 m2 (60 in2)
≈ 0.048 m2 (72 in2)
≈ 0.056 m2 (84 in2)
≈ 0.064 m2 (96 in2)
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