General space ventilation systems
Uniclass category Ss_65_40_33
Kitchen extract ventilation systems (1)
Ss_65_40_33_45
Natural ventilation systems (8)
Ss_65_40_33_56
Passive stack ventilation systems (1)
Ss_65_40_33_60
Toilet extract ventilation systems (1)
Ss_65_40_33_90