60*60*140 masentimita kukula hema yokhala ndi zolowera mpweya ndi zenera la mauna .Nyendo yolowera mpweya imatha kugwiritsa ntchito fyuluta ya kaboni, fani yapakati panjira, ndi zina zambiri; ndipo mazenera a mauna abwino kuti mpweya wabwino uzilowa pawindo.