IEC 60704-2-9:20 24 EXV包含国际标准及其扩展版本(EXV)。IEC官方标准的扩展版本仅提供英文版本，为用户提供了标准的全面内容。IEC 60704-2-9:20 24 EXV包括参考IEC 60704-1:20 21的内容。 IEC 60704-2-9:20 24适用于家用和类似用途的电动手持式吹风机，由市电供电，通过气流运行。这些特定的要求也可以应用于类似的电动操作装置，例如通过风扇产生气流的美发器具。头盔式吹风机不包括在本文件中。本文件不适用于辐射加热的护发器具。确定和验证产品规范中声明的噪声发射值，参见IEC 60704-3.本第二版取消并取代2003年出版的第一版。本版构成技术修订版。与上一版相比，此版本包括以下重大技术变更: a)符合IEC 60704-1:20 21。 本第2-9部分旨在与第四版IEC 60704-1:20 21: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:一般要求结合使用。

IEC 60704-2-9:2024 EXV contains both the international standard and its extended version (EXV). This extended version of the official IEC Standard is available in English only and provides the user with a comprehensive content of the Standard. IEC 60704-2-9:2024 EXV includes the content of the references made to IEC 60704-1:2021.

IEC 60704-2-9:2024 applies to electric hand-held hairdryers for household and similar use supplied from mains, which operate with a flow of air. These particular requirements can also be applied to analogous electrically operated devices such as hairstyling appliances, which produce the airflow by a fan. Helmet-type hairdryers are excluded from this document. This document does not apply to hair care appliances with radiant heating. For determining and verifying noise emission values declared in product specifications, see IEC 60704-3. This second edition cancels and replaces the first edition published in 2003. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) Alignment with IEC 60704-1:2021.
This part 2-9 is intended to be used in conjunction with the fourth edition of IEC 60704-1:2021: Household and similar electrical appliances - Test code for the determination of airborne acoustical noise - Part 1: General requirements.