Noise level of a ceiling fan on its lowest setting

Method

Sample of 58 fans surveyed at night, room closed, over three weeks. Fans with a blade catching on passage are excluded. The reading is taken one metre below the motor, away from the direct flow.

Source

No public source. Internal index.

Nature

Experimental index

Internal index. It relies on no public source and describes no identifiable institution or person.

Confidence

Low