Here is how our closed loop Mini dryers work with best drying performance through out the years.
Unlike most hot dryers our Mini desiccant bed dryers (DMD) work on closed loop basis. These dryers never take atmospheric air for process - ON condition. Without our DMD your polymers shall be at the mercy of the atmospheric air having RH any where from 50 to 98% depending on geographical condition and the season of the year. The difference will be noticed  when the plastic is being processed by way of production rate, deviating in colour or physical properties. Any engineering plastic processor having inclination towards ISO Certification or towards quality in general just cannot afford to take the risk.