Energy efficient blower delivers up to 390 CFM at 6.5 Sones OR 7 Sones at 600 CFM and 1200 CFM Two directional LED lights (3.5-Watt) (included) Remote control Made in the USA CFM, which is the measurement unit for exhausting air flow, stands for cubic feet per minute. The higher the CFM number, the greater the amount of air that is exhausted when using the range hood.A sone is an internationally recognized measurement unit for loudness that can provide an accurate indication of what humans can hear. If the number of sones is doubled, the loudness of a noise is also doubled (i.e., if a unit produces 2 sones of noise and another unit produces 4 sones, the second unit is twice as noisy as the first).One sone is equal to the soft hum of a refrigerator in a noiseless kitchen.
