This paper presents a reduced fan noise method, with increased fan-benefit analysis of various performances. The
experimental approach adopts changes in the outlet in the form of two fans (flat tongue and a V-Type tongue plate) in order
to measure the noise under the two forms of value and volume of supply air fan, shaft power consumption, operating current,
and static pressure. The results showed that the tongue plate and the V-plane tongue plate noise between the value of the
measurement location of 6.7 in the tongue plate in the plane below the noise level is about V-tongue plate 1 ~ 1.5dB (A). Air
flow rate testing showed that the flat plate and the V-Type tongue plate between the tongue plate V-Type flow rate value, the
measurement location of 3.4 in the tongue plate in the plane was more than the V-Type flow rate tongue plate 5 to 5.5%.
Shaft power testing of measurement model 3, and measurement model 4, showed that the tongue plate in the plane V-tongue
plate was more than 8%, 5%. The measurement models 3 and 4 and 5 showed more than the V-Type plane tongue plate 1%,
2.7%, and 2.6%. The measurement models 6 and 8 showed that, the flat tongue plate is less than the V-tongue plate of 2.9%
and 2.3%. Static pressure testing showed that the flat tongue plate in particular measurement models (3,4,8,9), the static
value of V-tongue plate than the 11.1% higher, respectively, 9%, 4.3%, and 3.7%. The results summarized above suggest that,
in the specific measurement points, when parallel to the tongue plate the V-tongue board has better performance.