PSI global filter silencers satisfy all Health and Safety Noise at Work regulations. Did you know? Rapidly expanding air can produce noise levels of 125 decibels - 40 decibels above HSE standards. This equates to a jet taking off and is obviously unacceptable in the workplace. It's a fact Noise levels can seriously affect worker's health and a company's bottom line (fines stc.). So what should you do? AAgain PSI Global has come up with a pure solution to solve this inherent industry problem. Effective use For any silencer to be effective, airflow should be directed towards the bottom of the element and evenly dispersed by the filter element. In a PSI Global silencer: oil in the the exhausting air coalesces on the outside of the element where it drains off into the collection bowl for safe drainage.