Fibglass duct e ka sebelisoa ho tsamaisa khase tlasa tikoloho ea khase ea kutu. Pipe e joalo e ka ba e chitja kapa e likhutlo, mme e ka hanyetsa khase e senyehang, joalo ka khase ea chlorine, khase ea flue, jj.
Boholo: E hlophisitsoe
Mohlala: Round, rectangular, sebopeho se ikhethileng, se hlophisitsoeng jj.