This is done either by fixed fans or by portable air-hoses led from nearby connections specially provided in the permanent ventilation system.
Oku kwenzeka ngokuxutywa kovuthelo okanye amathumbu amanzi omoya aphathekayo athunyelwe kufutshane nodibaniso olubalulekileyo olunikwa ngokukuko noxokolwelwano lokhupho.