六、 讨论 (Discussion)
+ 发现 分界高度 为关键设计诸元。在分界高度下，气流样态为对称的有利涡流，将空气有害物拦
截并拘束；涡流先将空气中有害物推向工作桌面，去除较大的污染微粒后，再由气帘举升到气罩开
口。(An important Dividing Height is observed. Air flow forms symmetric vortices
beneath this height, traps the contaminants, and pushes the contaminants up by air
curtains)
+ 发现 静滞区 及静滞区下方的涡流特性，足以解释 重力沉降及微粒黏合（coagulation）为何会
发生。(An important Quiet Zone and associated vortices beneath quiet zone are observed
to explain why gravitational settling and particle coagulation are encouraged)
+ 导烟机（TEAD）有效提升接收型气罩之捕集率，尤其是污染源位于分界高度之下且污染物之型态
为微粒（如油烟）时，此效果特别明显(TEAD helps to increase Capture Efficiency of the
wall-mounted receiving hood, especially when the emission source is beneath Dividing
Height and when the contaminants are particles.)
+ 对一般安装于墙面的接收型气罩（如实验室气罩或排油烟机）而言，使用TEAD的结果，使气罩的
捕集效率至少提高三倍。(For an average wall-mounted Laboratory Receiving Hood, Capture
Efficiency can be 3 times larger after TEAD is installed.)
+ 本研究发现，若将污染源放置于工作桌面，使用TEAD能使工作人员（如厨师或工厂作业人员）口
鼻呼吸带的空气中有害物浓度降低至少133倍：由于实验仪器能侦测的最高浓度为4ppm，使用TEAD
后能侦测到的呼吸带浓度均趋近于零，不使用TEAD的呼吸带浓度均远高于仪器侦测极限，故以使用
TEAD时能侦测到的最高浓度与仪器侦测能力上限4ppm作比较，得到最保守的保护倍数为133倍。(In
this study, when the emission source is placed on the work bench, TEAD offers 133
times better protection in operator’s breathing zone.)