Ventilation chimneys draw in air high above the ground where it is less dusty and take it down through rock stores underneath the building which temper the air
Iitshimini zomoya zitsala umoya phezulu kuba awunathuli kangako wona ze ziwuthobe uye kutsho ematyeni angaphantsi kwesakhiwo esi, nathi awuhluze phambi kokuba uye ufika