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 zentsimbi eziqhelekileyo, kwaye idlala indima yokuzimela ngokukhawuleza. , kunye nokutshintsha 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.