... feed mill, malt factory, distilleries, seaport, farm, and grain-processing centers, etc. 2.Some advantages of our product: 1. Lower ... Natural ventilation vents,Suction Fan,Ventilation Blower,Ventilation channel with net sheets;Ventilation System includes Natural ventilation vents,Suction ... bottom (all are available to the customers' demandings and drawings the diameter ranging from1.8 to 32 meter and ...