1,industrial cooling fan 2,CCC motor 3,CE and ISO9001 Certificate 4,large airflow low noise 5, high quality, best price TSBD-Negative-pressure air fanThe outline border adopt advanced automatic process, more accuracy, material galvanized sheet, good tensile and corrosion resistant. The 6-blade propeller is made of aluminium /magnesium alloy with light weight, high intensity and good toughness. ...