Unlike regular ceiling fans, the wall fans can be pretty loud in comparison. The ceiling fans feature long blades that do not make a lot of noise. But in comparison, the blades of a wall fan are comparatively very short and are designed to spin at a faster speed to match the performance of a regular ceiling fan. As a result, they generate more noise as the RPM of the motor is also very high. If noise levels are your primary concern, then consider buying a larger outdoor wall fan as it will create considerably lesser noise.