1,industrial cooling fan 2,CCC motor 3,CE and ISO9001 Certificate 4,large airflow low noise 5, high quality, ... automatic process, more accuracy, material galvanized sheet, good tensile and corrosion resistant. The 6-blade propeller is made of aluminium ... ,cow barn.Agriculture: greenhouse, horticulture Our products have got CE and ISO9001 Certification , so quality can be trusted ! Ventilation fans ...