... and two frequency 2.Protection class IP55,insulation class F 3.CE,CCC,UL certificate Hearrick Side Channel BlowerParameterWe ... - Enriching water with oxygen6. Food processing - Degasification7. Gas analysis8. Industrial vacuum cleaners, central extraction systems9. Lifting and holding parts using ... 50HZ and 60HZ in protection class IP55(insulation class F) are UL,CE,CCC approved.this makes them the ...