Inxalenye ye-boiler okanye isithando somsebenzi apho igcinwe khona ipetroli kwaye iqhushunjiswe ngokufanelekileyo. I-rate ikakhulu ibandakanya iinxalenye ezimbini: Isakhelo kunye neplate ye-grate. I-Grate ihlala yenziwe nge-iron yentsimbi, kwaye izithuba ezifanelekileyo ze-wist zigcinwa phakathi kwamaqhekeza ahlanganisiweyo kunye neziqwenga, kunye negumbi lokungena elizahluleleyo elinokuthi libekwe phantsi kwetyala le-vill ngokusa. I-ah etshisiweyo ikhutshiwe ngesandla okanye ngoomatshini. Uhlobo lwe-Grate luphawu oluzinzileyo, uhlobo olushukumayo, uhlobo lokuphinda lubuyisene, uhlobo lokufihlakeleyo kunye nohlobo oluphoselweyo.
