The use of vacuum suction and positivepressurefan to absorb and dry wind mosquitoes.
运用风扇负压吸力及正压风力来吸附和风干蚊子。
2
The potted seeding machine is characterized in that a negative pressurefan, a positivepressurefan, a seed tray, a potted seedling tray and a potted seeding tray are arranged on a stand;
该钵体播种机，机架上设有负压风机、正压风机、 种盘、钵体苗盘和钵体播种盘；
3
All sootblowers shall be provided with a positivepressure, sealing air system to wall boxes and poppet valves. This air shall be obtained from the seal air fan system.