Making use of advantageous time of low temperature in winter and spring,mechanical ventilation for bulk wheat in large storehouse was carried out to descend grain temperature,thereafter,heat insulating and sealing the grain bulks and low temperature grain storage test was carried out.

On the design of the Vietnamese flat warehouse confined insulation,grain access to warehouses of technology,ventilation,and cooling system for the fumigation experience.

The oxygen (coming) from positive electrode through AGM to negative electrode reacted with the lead electrode and was reduced to water under charging, the process was called oxygen recombination or closed oxygen cycling.