![]() When I do a home inspection, and the exhaust fan is rated at 1.0 sone or less, I will usually have to stop completely what I'm doing, and really focus on the sound - it is almost inaudible. One sone is equivalent to a very low hum. Read Also: The Best Bathroom Exhaust Fans With Humidity Sensors (Automatically Turns On) How Loud is 1 Sone? If the CFM is too large, it will be louder than necessary, use more energy than necessary, and may even create negative pressure problems in the home. If the CFM is too small, then it won't exhaust enough air (won't work well). You want to get the right ventilation fan speed for your bathroom. The lowest CFM fan you will find is likely 50 CFM which is suitable for small bathrooms.ħ5-100 CFM is rated for normal sized bathrooms.Īnything above 100-125 CFM is for larger sized bathrooms. A 100 CFM rated fan means that it will exhaust 100 cubic feet of air per minute. While the sone measures the loudness of the vent fan, CFM measures the fan speed or power.ĬFM stands for cubic feet per minute which basically means how fast the bath fan exhausts or moves air. How Does Bathroom Fan Sones Compare To CFM?įan sones and CFM are probably the two biggest ratings for bathroom exhaust fans. They are rated at 4.0 sones.īy the way, if you have an older fan, and it is quiet, this may be a sign that it is broken or malfunctioning. These exhaust fans can literally be heard a room or two away even if the bathroom door is closed. ![]() The most common "loud" bathroom exhaust fan in my area is the builder grade Broan 688 bathroom exhaust fan - these fans have been installed for many years. If the bathroom fan is 4 sones or more, then it is considered loud. If your bathroom exhaust fan is rated in the 2-3 sones range, I would say that is average to mediocre in terms of loudness. If the toilet paper sticks to the bath fan, then I know the vent fan is operating correctly. These modern quiet bathroom exhaust fans are sometimes difficult to even know that they are on! I sometimes have to take a piece of toilet paper, and place it up on the bath fan grill. In my experience as a home inspector, if the bathroom exhaust fan sones is 1.0 or less - that is considered a quiet (almost silent) ventilation exhaust fan. The basic thing to remember with the sones rating is that if you double the sones, the loudness is also doubled. In fact, all home appliances such as the dishwasher, range hood, and washing machine - their loudness is also measured using the sones rating system. Bathroom exhaust fan loudness is measured in sones.
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