Noise level
Acoustic measurement: The sound pressure level is measured in an anechoic chamber with very quiet background. All sound pressure test conditions should follow ISO7779 standard. For normal situation, the microphone is positioned one meter from the air intake of the testing fan. It shall be hanged in clean air. Refer ti the following diageam 1.
Diagram 1. Noise level measurement.
Noise level: Environmental sound pressure level in contrast with hearing.
| 0 ~ 20 dB | Extremely quiet |
5dB Ordinary hearing limit |
| 20 ~ 40 dB | Quiet | 20dB Fallen leaves 30dB Whispering |
| 40 ~ 60 dB | Normal | 40dB Library 50dB Quiet office |
| 60 ~ 80 dB | Noisy | 60dB Normal conversation 70dB Busy market |
| 80 ~ 100 dB | Very noisy | 80dB Subway 90dB Small press factory operation |
| 100 ~ 120 dB | Extremely noisy | 100dB Large press factory operation 120dB Jet engine |
Super low noise: Low noise is one of ZAWARD's fan characteristics, especially the Golf fan series. Its low flow turbulence of perfect 3-dimension impeller shapes and low flow resistance dimples surface design make more quiet rotating and more effective heat dissipation.
How to reduce the noise level: Refer to the heat dissipation of electric quuipments, list below the causes made the noise and the way to reduce it.