HVLS fans are usually not very loud. The design of these fans focuses on low RPM and high airflow while keeping noise levels low. For example, some HVLS fans operate at a maximum noise level of no more than 38 decibels (dB), which is comparatively low for a quiet environment in a library.
HVLS fans are able to maintain a low noise level primarily because they operate at a low RPM. Low RPM means that the fan blades produce less airflow noise as they rotate, and the blades and motors of modern HVLS fans are often optimally designed to reduce vibration and noise.
Additionally, HVLS fans are often mounted high, which also helps to minimize the impact of noise on areas where people are working or moving around. In large spaces such as industrial plants, warehouses or public places, the noise from HVLS fans is usually not a major source of disturbance.
Overall, HVLS fans are designed and manufactured with noise control in mind, so that under normal operating conditions they are not too loud and provide a comfortable environment for the user.