ASHRAE 110-2012
This standard is the most widely accepted test method for chemical fume hood containment, and for 2012, there are few changes. The major difference between the new version and the test method used today is the height of the mannequin placed in front of the fume hood during tracer gas testing. Expect a reduction of about 4” in mannequin height, resulting in a much more difficult test. The new standard will also encourage the use of electronic data logging. There has been some talk of switching tracer gas from sulfur hexafluoride to nitrous oxide, but don’t expect this change anytime soon.
该标准是目前最被广泛接受的测试方法化学通风柜遏制，并为2012年，也有一些变化。新版本和目前使用的测试方法之间的主要区别是在人体模型的示踪气体检测过程中放置在通风橱前面的高度。预计约4“的模特高度降低，从而导致更加艰难的考验。新标准也将鼓励使用电子数据记录。已经有切换示踪气体六氟化硫以一氧化二氮的一些谈话，但不要指望这种变化很快。
NFPA 45-2011
The recognized acceptable minimum volumetric rate (CFM) of air for fume hood exhaust is typically cited from National Fire Protection Association’s NFPA 45 recommendation of 25 CFM per interior square foot of work area. This data is used by mechanical system designers, air balancers, Variable Air Volume (VAV) and mechanical contractors. As the sash is closed on a fume hood installed in conjunction with a VAV system, the volumetric rate of air is reduced to maintain a constant face velocity (fpm).
However, the standard noted above, gives a floor to this reduction in volumetric rate. In simple terms, no matter how far you close the sash, the VAV system will never go below this volumetric rate. This minimum provides the basis for mechanical design and life cycle cost assessment. However, for 2011, NFPA 45 has changed the language in their standard as follows"
"...hood exhaust airflow should not be reduced to less than the flow rate recommended in ANSI Z9.5, Laboratory Ventilation."
空气公认可接受的最低容积率（CFM）的通风柜排风通常引述的内部每平方英尺的办公区25 CFM国家防火协会的NFPA45建议。这个数据被用于由机械系统的设计者，空气平衡器，变风量（VAV）和机械承包商。如窗框上??安装了VAV系统一起通风柜关闭，空气的体积率减少，以保持恒定表面速度（fpm的）。
然而，上面提到的标准，使地板这个降低容积率。简单来说，不管多远关闭窗扇，变风量空调系统永远不会低于此容积率。这个最小提供了基础机械设计和生命周期成本评估。然而，2011年，美国消防协会45改变了语言，其标准如下“
“......橱排气气流不应被降低到小于推荐在ANSI Z9.5，实验室通风流量。”
ANSI Z9.5 2011
Currently the American National Standards Institute (ANSI) Z9.5 for 2011 is still not released. In the 2011 version, ANSI Z9.5 standard will reflect a new minimum of 150 air changes per hour inside the fume hood. As long as this new minimum is adequate for the specific application, and depending on fume hood dimensions, this is approximately 52-60% reduction in the minimum volumetric rate of air.
Considering fume hoods should spend most of their life with their sashes closed, this represents a dramatic reduction in energy consumption, and consequently operating cost. Look for changes in the minimum air change requirement for the laboratory as well. The new number could be as low as two air changes per hour during unoccupied times. If you have any questions regarding laboratory planning, current standards, products or require a bid, please call our Sales Engineering Group at 40099-33886.
目前，美国国家标准学会（ANSI）Z9.52011年仍然没有公布。在2011年的版本，ANSI Z9.5标准将反映新的最低每小时150换气的通风橱内。只要这个新的最低是足够的具体应用，并且根据通风柜的尺寸，这是在空气中的最小容积率约52-60％的减少。
考虑到通风柜应该花大部分的生活与他们的窗扇关闭，这代表了大幅降低能源消耗，因此运营成本。寻找变化最小空气变化要求的实验室以及。新的数字可能低至每小时在空闲时间两空的变化。如果您对实验室的规划有任何疑问，目前的标准，产品或要求投标，请拨打我们的销售工程集团40099-33886。
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