Loon 140mm performance case fan has a true 48.5 dB(a) decibel rating - measured
in an anechoic chamber using ISO standards. This is one instance where
the case fan's decibel ratings haven't been understated by the
manufacturer. So this case fan is not purchased for quiet PC's.This 140mm case fan is extremely high performance case fan. It measures a whopping 140 CFM airflow level and is available at a
reasonable price. This high flow fan also includes the added advantage of
both a 3-pin motherboard power connector and a 4-pin standard power
connector making this a very versatile case fan.