The JULI®oval ventilation duct e sebelisoa bakeng sa kamore e tlase ea hlooho kapa lithanele tse nyane tsa morafo tse nang le moeli oa bophahamo.E entsoe ka sebopeho sa oval ho fokotsa tlhoko ea kamore ea hlooho ka 25% ho lumella lisebelisoa tse kholo ho sebelisoa.