Many people turn off their bathroom exhaust fans immediately after showering, which can lead to significant residual moisture and mold growth. Experts emphasize that the real issue is not just the visible steam but the hidden humidity that remains. A report from The Economic Times highlights that upgrading to humidity-sensing or timer-based fan controls can decrease moisture accumulation by 40 to 50 percent. Research conducted by Farhana Ahmed and colleagues from Dhaka, Bangladesh, demonstrated that poor airflow exacerbates condensation issues, leading to mold growth in bathrooms, particularly in humid regions. The common mistake of prematurely turning off fans traps moisture, causing long-term damage such as peeling paint and warped materials. Conversely, automated fan systems ensure that humidity levels drop back to safe thresholds, running for 20 to 60 minutes post-shower. Studies from the University of Oregon further support this approach, showing that timer-controlled fans maintain stable humidity levels below the mold-risk threshold. By adopting these smart ventilation solutions, homeowners can significantly improve indoor air quality and prevent costly repairs associated with moisture damage.