d ventilating-fan system
强制进气排气通风系统
Ventilation: positive downdraft exhaust ventilation should be provided to maintain vapor concentration below TLV.
通风：为了使气体聚集程度维持在阀极限值之下，应提供通畅的向下棋流排气通风设施。
NF3 has no detectable odor, so forced air/exhaust ventilation and ambient air monitoring are recommended where NF3 is stored or used.
NF3没有可以探测到的气味，所以推荐在储存和或使用NF3的地方采用强迫通风/排气通风。
combined down cast up-take ventilator
给气、排气两用通风筒
downcast and uptake ventilator
下向和上向通风筒吸排气两用通风机
The laboratory exhaust system includes exhaust duct works, exhaust fan, laboratory fume hood exhaust, laboratory canopy hood and cabinets needed venting.
实验室排气系统包括排气管路、气风机、验室通风柜管道、验室排风罩和特殊存储柜的排气管道。
Propeller fans exhaust air through holes in the wall.
螺旋式通风机从壁孔中排出空气。
There is a vent in the wall.
墙壁上有一个排气 [通风] 孔。
Harmful gases must be drawn out by centrifugal ventilator.
有害气体必须通过离心式通风装置排出。
A shaft, flue, or stack for ventilation or the passage of smoke, especially the smokestack of a ship or locomotive.
烟囱，通风井尤指轮船或机车上的用来通风或排烟的通风井、烟道或排气管
A device that circulates fresh air and expels stale or foul air.
通风设备流通新鲜空气并排放污浊有害空气的设备
or operate sprinkler systems to extinguish fires and remove toxic gases from the atmosphere.
或者起动喷水设施灭火，并且通风排除有毒气体。
Be like inside door work must assemble ventilator, ensure indoor airflow.
如室内工作须装配排风扇，保证室内空气流通。
High-rise residential ventilation and exhaust flue gas flow backward Road Analysis System
高层住宅的通风与排烟道烟气倒灌系统的分析
The pump exhaust should lead to the open air or a fume hood.
抽气泵的排气管应该导向室外空旷处或导向一座通风橱。
Baffles: Baffles providing controlled air vectors into and through the fume hood shall be constructed from the same material as the liner.
扰流板：扰流板应该和内衬材料一致，其引导通风柜气体排除柜外。
Ventilation is concerned with the supply of fresh air, the removal of contaminants and heat.
通风涉及的是新鲜空气的供应，污染物和热量的排除。
Research on Vehicle Exhaust Emission Concentrations&Ventilation System of City-highway Tunnel
城市公路隧道汽车尾气排放浓度的研究及通风方案的设计