负压风机是利用空气对流、负压换气的降温原理，是一种由安装地点的对向---大门或窗户自然吸入新鲜空气，将室内闷热气体迅速强制排出室外，任何通风不良问题均可改善的机器，降温换气效果可达90%-97%。
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；
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;
调节引风机，使上箱体中床层物料上部保持微负压，维持良好的干燥环境并防止粉尘外泄（略）。
Fan regulation, which box on the bed material to maintain the upper-vacuum, maintain good dry environment and prevent dust leakage.
在紧密纺大风机系统设计中，车头、车尾各锭的负压差异要保持在允许误差范围之内。
When designing FDF system of compact spinning, the negative pressure drops resulting from spindles at the front and back of the machine should be kept within allowance.
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