... 3.Fine performance 4.Good price 5.Satisfactory service Ventilation fan BTXS-36'' --- 56'' ModelDiameterBlades (mm)Air Flow (m3/h) ... , vibration test, concentric performance test, fan blade rotation test, wind capacity test and the efficiency test7. with CE, CCC, ISO certificateApplication: The ... ,breeding room,workshop,super market and other spaces for air cooling and ventilation system. Cooling Fan