In most cases, the larger the high-velocity fan is, the more powerful the airflow will be. Both of these factors contribute to the noise level these models produce. Of course, the more modern products are actually designed to stay below a certain decibel level, making them much quieter than fans sold years ago. Most of the high-velocity fans on the market are about as loud as a white noise machine, even on their highest speed settings, so you likely won’t be too disturbed by them, unless you are extremely sensitive to noise.