The main purpose of a bathroom fan is to remove excess moisture from the air after showering, bathing or using the toilet. Without proper ventilation, high humidity levels can cause damage to walls, ceilings, wood trim and other bathroom materials through moisture accumulation and mold growth. Bathroom fans work by pulling air out of the room through a vent or duct to the outside. This creates negative air pressure, drawing moist air up and out of the bathroom. The moving air also helps to dry surfaces faster. Bathroom fans typically operate automatically when the light is turned on, and some have adjustable timers to run for a set period after use. This helps ensure that all moisture is removed from the air. In summary, bathroom fans are essential for maintaining a healthy, dry environment and preventing costly moisture damage in bathrooms.
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Multiple times I worked on cases of microbial growth due to the moisture build-up in the bathrooms. Usually in kids bathroom who like excessively long and hot showers. Even though the fan should’ve been powerful enough for the room that size, the main issue was also in the gap under the bathroom door (not big enough after recent bathroom renovation) that failed to supply enough make-up air.
From the professional home inspector’s perspective, do you have recommendations or is there standards for that gap?