When it comes to choosing an exhaust fan for your bathroom, you might think that the more CFM, or cubic feet per minute, the better. However, having too much CFM in your bathroom exhaust fan can cause some unforeseen problems. While the fan might be drawing more power than it needs, the additional CFM could cause drafts or create an inability to dry the remaining moisture in the bathroom. Here are some potential issues that you might experience with an exhaust fan that has too much CFM:
Drafts: If the bathroom exhaust fan has too much CFM, it can create drafts in the room, which can be especially uncomfortable during the winter months. The fan might pull too much air out of the room, which can result in cold air coming in through gaps or cracks in the walls or windows.
Lack of moisture removal: While it might sound counterintuitive, having too much CFM in your bathroom exhaust fan can actually result in a lack of moisture removal. If the fan is too powerful for the size of your bathroom, it can draw out the humidity and moisture too quickly, which can create an environment where the remaining moisture has nowhere to go. This can result in excess moisture on surfaces, which can lead to mold or mildew growth.
Excessive noise: Bathroom exhaust fans with high CFM ratings can be incredibly loud, which can be especially disruptive if you have a bathroom that is located near bedrooms. Additionally, if the fan is too powerful for the size of your bathroom, it might not be able to sustain a consistent airflow, which can create a choppy, uneven sound.
It’s important to choose the right size and power of bathroom exhaust fan for your space to avoid the problems that can arise from having too much CFM. Consider the size of your bathroom, the level of humidity and moisture in the room, and your personal preferences when choosing an exhaust fan.
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