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Your bathroom exhaust fan shouldn't be loud. However, bath fans come in a wide variety of models, price points, and loudness characteristics, and yours may be louder or quieter than others you notice. Economy models tend to be the noisiest, with levels of 4.0 sones or more, which is about the sound of an electric shaver, while some high-end models can be barely audible. 

The number of blades for your fan poses both advantages and disadvantages. Typically, the more blades on a fan, the better the air distribution and cooling effect, but this also means that your fan will have more wear on its motor. For small rooms, three-blade fans should work fine. For larger areas like living rooms, four or five-blade fans might be the better option. 

Some disadvantages of a blower cooler—a type of cooling device sometimes known as a swamp cooler—are its increased energy demand and its higher noise level. Blowers require more energy to run because they push air out at a higher pressure. This also means a blower cooler can be louder than a fan. Blower coolers are also not recommended for humid areas because humidity limits their cooling potential.

While ceiling fans are built for regular use, running them continuously without breaks can lead to overheating and wear over time. If your fan has a thermal shutoff feature, it may stop running to protect the motor. To extend their lifespan, it’s best to turn fans off when they’re not needed.