All devices intended specifically to be used for disinfecting or sterilising medical devices are classified as class IIa, unless they are disinfecting solutions or washer-disinfectors intended specifically to be used for disinfecting invasive devices, as the end point of processing, in which case they are classified as class IIb.
Tá na feistí ar fad a beartaíodh go sonrach chun feistí a dhífhabhtú nó a steiriliú aicmithe mar aicme IIa, ach amháin más tuaslagáin dhífhabhtaithe nó dífhabhtóirí glantóra iad a beartaíodh go sonrach le haghaidh feistí ionracha a dhífhabhtú, mar chríochphointe na próiseála, agus sa chás sin tá siad aicmithe mar aicme IIb.