Edwards Inlet or Exhaust Filter KF40 NW40 for XDS35i dry scroll pumps. The inlet dust filter has two functions. It can be connected inline between the pump inlet and your chamber outlet connection to prevent dust from migrating into your system. Alternatively, it can be connected inline between the pump exhaust and your exhaust extraction system. The filter is supplied ready to use with a 5 micron element. Note: If connecting the exhaust filter onto the pump outlet, a NW40 hose nozzle, C10516628 is available to connect onto the outlet of the dust filter. Edwards Part Number is NRD383000