The use of vacuum suction and positive pressure fan 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。
The potted seeding machine is characterized in that a negative pressure fan, a positive pressure fan, 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；
All sootblowers shall be provided with a positive pressure, sealing air system to wall boxes and poppet valves. This air shall be obtained from the seal air fan system.
所有的吹灰器都应配有正压、密封空气系统至壁箱和圆盘阀。该处空气来自密封空气风机系统。
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