Iingcango zeglasi ezingatshiyo ziingcango zeglasi ezikhuselekileyo. Ukuqina kweglasi engatshiyo yi-6 ~ 12 umphinda-phindene weglasi edadayo kunye ne-2 ~ 3 umphinda-phindeke kwiglasi epholileyo. Iingcango zeglasi ezikwazi ukumelana nomlilo zinokumelana nomlilo ophezulu kwaye zinokutshisa kwidangatye; banokumelana nemozulu ephezulu kwaye bayakwazi ukumelana nelanga nemvula.

kufuneka ube yintoni umbala womnyango wokuphuma emlilweni,umnyango womlilo vs umnyango oqhelekileyo, ipleyiti yokukhaba yocango,Ikhowudi yomlilo yokuphuma, indlela ezimbini zokuphuma komnyango,

umenzi wocango okwaziyo ukumelana nomlilo,kufuneka ube yintoni umbala womnyango wokuphuma emlilweni,ucango oluphambili olungatshiyo, izixhobo ezingqina umlilo,phuma ikhowudi yomlilo emnyango,Ubukhulu bocango olulinganiswe nomlilo, umnyango wentsimbi x,Indlela ezimbini yokuphuma komnyango womlilo,Ucango olunomlilo oluyimizuzu engama-90, 600mm umnyango wentsimbi, 

iingcango zamaplanga ezingatshiyo, ucango lokutyhala umlilo lokuphuma,phuma ikhowudi yomlilo emnyango,Ucango olunomgangatho womlilo ul, indawo yokuhlala enocango lomlilo