The fan is a mechanical motor that produces sound, of which the level of noise is subjective to each individual. People have differing sound preferences based on their sound sensitivity. Our design specialists discuss the sound and placement of the radon exhaust fan is chosen based on each homeowner's unique needs. While we can’t change the mechanical noise, we do have options to address air flow noise such as our muffler and fan cover. Our fans don’t yellow over time as they are UV resistant.