Kukho iibrashi zokutywina ezinamacala amabini kumacala omabini esakhelo socango, kwaye umzantsi uxhotyiswe ngamakhethini ePvc.Umnyango unokuvulwa kwaye uvalwe ngokukhawuleza, kwaye isantya sokuvula sinokufikelela kwi-0.2-1.2 m / s, ephantse ibe ngama-10 ngokukhawuleza kuneengcango eziqhelekileyo zentsimbi, kwaye idlala indima yokuzimela ngokukhawuleza., ngokutshintsha ngokukhawuleza, ukufudumala ukushisa, uthuli, inambuzane, isandi kunye neminye imisebenzi yokukhusela, yinto yokuqala yokukhetha ukunciphisa ukusetyenziswa kwamandla, ukugcina uthuli lungenathuli, lucocekile kwaye luhlala njalo, kunye nokuqinisekisa indawo yokusebenza ecocekileyo.