Depending on the type of fan, it could cost anywhere from $30 to $200. However, the most common type of bathroom exhaust fan - the so-called "inline" or "through-the-wall" fan - tends to cost around $60. It's important to note that it's not just the cost of the fan that needs to be considered, but also the cost of having a professional install it. So in addition to whatever the fan costs, there will also be a labor cost that ranges from $50 to $100.

It should cost about $150 to replace a bathroom exhaust fan. However, this may vary depending on the brand and type of fan you choose. Additionally, if you need to hire a professional to install the fan, that will add to the overall cost. When choosing a bathroom exhaust fan, it's important to consider the size of the room and how powerful the fan needs to be in order to effectively remove moisture and humidity from the air. You also want to make sure that the fan is rated for use in damp environments, as this will ensure that it is properly protected against moisture damage.