The negative pressure airexhaustingdevice can effectively prevent combustible gas from exploding under positive pressure so as to ensure safety production.
负压排风装置可有效预防 可燃气体正压爆炸，保证安全生产；
2
A simple filtering and oil-recovery device for purifying the mould cooling air containing large amount of oil fumes in the exhausting pipelines has been described.
介绍了一个简单的过滤和油回收装置，用于带油烟的模具冷却凤排放时进行净化和油回收。
3
The non-bleed controller uses air only when exhausting the line to the controlled device .