Another metric
of noise is dB(A), representing relative loudness of sounds in air,
which is a more common metric for environmental measurements.
However, dB(A) and sone are not interchangeable units due to the
different measurement methods. Based on our measurements of
dB(A) using a sound level meter (Larson Davis, Model LXT1), the
noise level for both fans ranged from 65 dB(A) to 75 dB(A) over the
tested fan flow rates (100 m3/h to 830 m3/h). The highest value was
observed in the kitchen and the lowest in the master bedroom.
These measurements are somewhat higher than those in a study by