IEC 60704-2-7:20 20 RLV包含官方IEC国际标准及其红线版本。Redline版本不是官方文档，它只有英文版本，为您提供了一种快速简单的方法来比较IEC官方标准与其以前版本之间的所有变化。 IEC 60704-2-7:20 20适用于设计用于交流或DC电源的家用和类似用途的电风扇（包括其附件和部件）。马达、叶轮和它们的壳体(如果有的话)形成单个单元。这些特殊要求适用于: -常规风扇， -台扇， -基座风扇， -吊扇， -无叶片风扇， -壁挂式风扇， -吊顶支架风扇， -百叶窗风扇， -塔迷， -通风和分区换气扇。 本标准不适用于:-作为通风系统的一部分的风扇， -专为工业用途而设计的风扇， -作为器具的一部分的风扇(例如冷却风扇)， -具有附加功能（例如加热、加湿）的风扇。 IEC 60704-1的范围内给出了该测试代码的使用限制。 这第二版取消并取代了1997年出版的第一版。本版构成技术修订版。 与上一版相比，此版本包含以下重大变更: a)它包括IEC 60879:2019和IEC 60665:2018中定义的附加风扇类别； b)它包括1.3中声功率级的标准偏差； c)增加了比较方法； d)规范性参考文献已更新（ISO 3744:2010和ISO 3743-1:2010); e)已根据IEC 60704-1:20 10进行了调整。 本国际标准将与IEC 60704 1:20 10《家用和类似用途电器——空气传播声噪声测定的试验规范——第1部分:一般要求》一起使用。本第2-7部分补充或修改了IEC 60704-1:20 10中的相应条款，从而建立了风机的试验规范。

IEC 60704-2-7:2020 RLV contains both the official IEC International Standard and its Redline version. The Redline version is not an official document, it is available in English only and provides you with a quick and easy way to compare all the changes between the official IEC Standard and its previous edition. IEC 60704-2-7:2020 applies to electrical fans (including their accessories and their component parts) for household and similar use, designed for AC or DC supply. The motor, the impeller and their housing, if any, form a single unit. These particular requirements apply to:
– conventional fans,
– table fans,
– pedestal fans,
– ceiling fans,
– bladeless fans,
– wall bracket fans,
– ceiling bracket fans,
– louver fans,
– tower fans,
– ventilating and partition ventilating fans.
This standard does not apply to:
– fans that are part of a ventilation system,
– fans designed exclusively for industrial purposes,
– fans that are part of an appliance (for example cooling fans),
– fans with additional functions (for example heating, humidifying).
Limitations for the use of this test code are given in the scope of IEC 60704-1.
This second edition cancels and replaces the first edition published in 1997. This edition constitutes a technical revision.
This edition includes the following significant changes with respect to the previous edition:
a) it includes additional fan categories as defined in IEC 60879:2019 and IEC 60665:2018;
b) it includes standard deviations of sound power levels in 1.3;
c) a comparison method has been added;
d) the normative references have been updated (ISO 3744:2010 and ISO 3743-1:2010);
e) it has been adjusted with regard to IEC 60704-1:2010.
This International Standard is to be used in conjunction with IEC 60704 1:2010, Household and similar electrical appliances – Test code for the determination of airborne acoustical noise – Part 1: General requirements. This Part 2-7 supplements or modifies the corresponding clauses in IEC 60704-1:2010, so as to establish the test code for fans.