... bolts.4. Easy to understand . The bolted silo is equipped with relevant accessories, such as: conveyor, ventilation, drying and monitoring ... The cost of bolted silo is just 35%-50% of the cement silo with the same specification; and its life span ... Natural ventilation vents,Suction Fan,Ventilation Blower,Ventilation channel with net sheets;Ventilation System includes Natural ventilation vents,Suction ...