Za a shigar da mai dumama bututun iska a cikin bututu mai zagaye bayan matatar iska mai shigowa, kafin shigar da naúrar HRV.An ƙirƙira shi don hana yanayin daskarewa, watau guje wa ƙirƙirar ɗan matsi mara kyau a cikin gida.Ma'aunin zafi da sanyio yana sarrafa mai dumama, yana canzawa ƙarƙashin ƙananan yanayin zafi na waje kawai.