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ventilation noise

We've just installed a new double-walled psychoacoustic booth and are
wondering about acceptable levels of ventilation noise.  After a first
change of ventilators the level in a 1/3 octave band at 100Hz is down to
about 40 dB SPL, as measured by a B&K sound meter (when ventilation is off
the meter fluctuates around 20 dB SPL).  We're wondering if we should
accept this as normal.  Has anyone made similar measures in a similar
booth?  Any insights are welcome.