RV 1.1535/11-002/10

... Accessories, such as intake filter or air discharge sound absorber, are available as optional extras.

see also: Becker recirculating fans for CO₂ lasers

The frequency inverter integrated in the VARIAIR UNIT significantly enhances the performance data of the pump. It matches pump delivery exactly to customer requirements. Energy consumption is optimised and constant pressure is guaranteed even where demand is subject to variation or severe fluctuation. As no unnecessary suction air is generated, noise is kept to a minimum. Dirt from the surrounding environment is kept out of the  pumps. "Gentle" pump start-up reduces strain on mechanical components and reliably extends their useful life. Variable output ranges minimise the number of different types required, thus also providing logistical advantages.