The nXDS silencer has two main function: to reduce exhaust noise during pump down and gas ballast operation, and to collect and retain tip seal dust as the pump is operated. Exhaust gases exit the exhaust port when the pump is being used to evacuate a process chamber, when the gas ballast control is being used, or both. The noise level when pumping down rises as the throughput increases and the silencer is used to reduce this noise level. The outer can is made of pressed steel and is split to allow access to the filter elements. The filter element housing is made from Santoprene® thermoplastic elastomer. The element itself is polyester. The foam block is manufactured from filter foam.

The nXDS silencer has been manufactured with an NW25 fitting to enable fitting to the nXDS pump exhaust. An NW25 clamp and centring ring are included.