MaintenanceOperating_Manual_Fan_KXE_04_en.docx 108 / 128Several carbon graphite sealing rings are used for thelabyrinth seal. There are four variants of labyrinth seal:Type Structural designREW701-01 Suitable for connection to re-lubricationdevice (grease injector), maximumhandled gas temperature +80 °CREW701-11 Suitable for connection to re-lubricationdevice (grease injector), maximumhandled gas temperature +180 °CREW701-22 Suitable for connection to barrier gas lineREW702-22 Suitable for connection to barrier gas lineand with drainageNOTICE!Refer also to the separate instructions of the labyrinthseal manufacturer.NOTICE!Sealing rings and complete seals may be ordereddirectly from REITZ. Always specify the serialnumber of the fan when ordering.Fan configuration in accordance with ATEX (optional):If the fan is intended for use in potentially explosiveenvironments pursuant to Directive 2014/34/EU (ATEX), theshaft seal must be connected to a barrier gas line.Connection to a re-lubrication device (grease injector) isprohibited13.3.3 Labyrinth seal1231 Connection to grease injector orbarrier gas2 Drainage (optional)3 Fan housingFig. 13-6 Labyrinth sealTable 13-13 Labyrinth seals