密闭式通风系统
closed ventilation system
封闭通风式电动机
enclosed ventilated motor
边界式通风系统
unidirectional ventilation system
单翼对角式通风系统
one-winged diagonal system of ventilation
两翼对角式通风系统
two-winged diagonal system of ventilation
全封闭通风
total enclosed ventilation
压力系统封闭性
closure of pressure system
自封闭系统体系
self-sealing closed system
集中式空调通风系统
Heating ventilation and conditioning systems
《房委会空气调节及通风系统承办商名册》
Housing Authority List of Air Conditioning and Ventilation Contractors