Fitar da ke ɗauke da numfashi na'urar likita ce da ake amfani da ita don tace ƙwayoyin cuta, ƙwayoyin cuta, da sauran gurɓata daga iskar da majiyyata ke shaka yayin maganin sa barci ko iskar inji.Fitar da za a iya zubarwa ne wanda aka sanya shi a cikin da'irar numfashi tsakanin majiyyaci da injin hura iska ko injin sa barci.An tsara tacewa don kamawa da cire ƙwayoyin cuta da sauran ƙwayoyin cuta masu cutarwa waɗanda ke haifar da cututtukan numfashi da sauran rikitarwa.Tacewar ƙwayar cuta ta kewayen numfashi wani muhimmin sashi ne na sarrafa kamuwa da cuta a asibitoci da wuraren kiwon lafiya, yana taimakawa wajen rage yaduwar cututtuka da kare marasa lafiya da ma’aikatan kiwon lafiya iri ɗaya.