My sister has a mold problem growing in her bathroom, and she was at her wits end when she showed it to me. The first thing I did was look up at her ceiling and say, "Does your bathroom fan even work?" I don't normally buy gifts for my sister, but that day, I decided to buy her a new bathroom fan because whatever my sister had in her bathroom just wasn't powerful enough.
Mold can only grow when the humidity level is above 65%, so keeping the area dry is the first step to combatting a mold problem. My sister's bathroom is approximately 8' x 8' x 8', and they take anywhere from 5 to 8 hot showers a day in her family of five. The first thing I had to calculate was how much CFM (cubic feet per minute) would be a powerful enough air exchange for that size bathroom. For an 8' ceiling, the formula for calculating CFM was Length x Width x 1.1 (8 x 8 x 1.1), which equaled 70.4 CFM. But because they take so many showers in that family, I decided to buy the next size up, which is a 100 CFM bathroom fan.
I searched online at Lowes for a 100 CFM bathroom fan with a light at a price that I could afford. And I was thrilled when I found the Broan White 100 CFM Bathroom Fan with a Light for only $55.90. That is a great price for a powerful bathroom fan, so I ordered it and had it shipped to the store for pick-up. I have a Broan 70 CFM Bathroom Fan with a Light in my own bathroom and it works great. Its noise level is rated at 4 scones out of a possible 5, meaning that it's a little noisy to run the fan, but the noise never bothered me, and in fact, it reminds me that I need to turn the fan off when I'm done in the bathroom. I'd never installed a bathroom fan before, but Lowes had a 6 minute online video at YouTube, "How to Replace and Install a Bathroom Ventilation Fan". The video helped to make this an easy do-it-yourself project. And my sister is thrilled with her new bathroom fan.