A Ukugeleza komoya okuphakanyisiwe ukufinyelela phansi kunika amandla ukuphathwa kwe-airflow okusebenzayo ngokuqondisa umoya opholile ngokunembile kuma-racks amathuluzi, ukuvimbela izindawo ezishisayo kanye nokuqinisekisa ukupholisa okusebenzayo. Idizayini ephansi ephakanyisiwe yakha iplenum engaphansi lapho lapho kufakwa khona amasistimu wokusabalalisa umoya, njenge-HVAC ducts, kungafakwa ekupholiseni okuhlosiwe futhi okusebenzayo.