... forced air cooling of electronic equipment, the merits of compact,good appearance, lownoise,low consumption.12. Use high efficient radiator, ... complex wind channel technic improve the heat transfer.13. Good computer supervisory control,simple operation and a high degree of automation ... .6. Step-by-step of frequency adjustment: 1Hz.7. Computer interface: RS232,RS485, RJ45 and support SNMP.8. Linearity ...