The consistent whirring can be distracting if you plan to use the diffuser for meditation or in quiet environments.
You can enjoy a television program without having to increase the volume to overcome the whirring sounds of a fan.
A low humming or whirring noise typically emits from the machine as the mechanisms rotate.
While there are those couples who do everything they can do make sure the press gets wind of their special day, there are those who would rather not exchange vows over the sounds of whirring helicopters and clicking cameras.
When you turn on your battery powered dog nail file, you will notice that it makes a whirring noise.