A bathroom exhaust fan is useful in controlling humidity and odors in the bathroom. The absence of an exhaust fan does not pose a grave risk, but it does increase the dangers associated with fumes that may pose a health risk.
The exhaust fan helps to remove steam from the bathroom before it condenses on the walls of the bathroom. Most people use chemical cleaners of all kinds to clean and disinfect the bathroom. Some of these cleaners emit foul odors and fumes that need to be removed as quickly as possible. Mold can easily form in the bathroom due to excess humidity. An exhaust fan helps to reduce the build-up of spores that cause mold.