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The Sound Power Level from fans depends on the motor power and the capacity of the fan - the static pressure and/or the discharged volume.
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The empiric expressions below can be used to estimate the Sound Power Levels from fans. Note! Exact Sound Power Levels must be obtained from the manufacturers specifications.
Lw = 67 + 10 log( S ) + 10 log( p ) (1a)
Lw = 40 + 10 log( Q )+ 20 log( p ) (1b)
Lw = 94 + 20 log( S ) - 10 log( Q ) (1c)where
S = rated motor power (kW)
p = fan static pressure (Pa, N/m2)
Q = volume discharged (m3/s)
Lw = 90 + 10 log( s ) + 10 log( h ) (2a)
Lw = 55 + 10 log( q ) + 20 log( h ) (2b)
Lw = 125 + 20 log( s ) - 10 log( q ) (2c)where
s = rated motor power (hp)
h = fan static head (inch water gauge)
q = volume discharged (ft3/min)
The discharge velocity from a fans should in general be kept within certain limits to avoid a noisy operation. As a guidance the following values can be used:
| Application | Maximum Discharge Velocity (m/s) | |
| Supply System | Exhaust
System |
|
| Sound studios, churches, libraries | 4 - 5 | 5 - 7 |
| Cinemas, theatres, ballrooms | 5 - 7 | 6 - 8 |
| Restaurants, offices, hotels, shops | 6 - 8 | 7 - 9 |
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