IEC 60335-2-31:2024 is the sixth edition of the specific safety standard for kitchen extract hoods published by the International Electrotechnical Commission, replacing the fifth edition from 2012 and its 2016 and 2018 amendments. This standard aligns with the general safety standard IEC 60335-1:2020, reflecting technical advancements in kitchen environments regarding installation methods (such as top-mounted, side-mounted, rear-mounted, or bottom-mounted), remote control functions, and surface safety. Key technical changes include: converting certain notes into normative text (Clause 1, 22.8, 22.101, 22.102); updating heating test installation requirements to cover down-draft systems (11.2); adding limits for accessible surface temperatures (11.3, 11.8); introducing IEC TR 62854 to address compliance with sharp edge testing (22.14); clarifying remote operation requirements (22.40, 22.49, 22.51); and clarifying tests for grease filters and odor filters (30.101).
The standard applies to household kitchen extract hoods and other cooking fume extractors with a rated voltage not exceeding 250V (including DC supply), which can be installed above, to the side, behind, or below the cooking appliance. Cooking appliances may be powered by electricity or other fuels (such as gas). Appliances intended for non-household use but which may pose a danger to the public (such as those used by non-professionals in shops, light industry, and farms) are also included. Exclusions are: commercial appliances (covered by IEC 60335-2-99); appliances for special conditions (such as corrosive or explosive atmospheres).
| Technical Dimension | Fifth Edition (2012+Amd) | Sixth Edition (2024) | Impact Description |
|---|---|---|---|
| Heating Test Installation Requirements | Only covers traditional top-mounted installations | Added installation requirements for down-draft systems | Forces more realistic thermal testing for down-draft products |
| Accessible Surface Temperature | No explicit limits | Added maximum temperature rise specified in Table 101 | Prevents user burns and enhances safety |
| Sharp Edge Testing | No dedicated test method referenced | Introduced IEC TR 62854 for determination | More operational and consistent |
| Remote Operation Requirements | Basic requirements | 22.40/22.49/22.51 clarify functional safety | Adapts to smart home trends |
| Grease Filter Testing | Not specifically emphasized | 30.101 clarifies test methods and rationale | Enhances fire safety |
Accessible Surface Temperature Limits: The newly added Table 101 in the standard specifies the allowable maximum temperature rise for specific external surfaces (such as handles and panels) under normal operating conditions. For example, the temperature rise of a metal handle should not exceed a specific value to avoid user burns. Practical application case: A brand's kitchen extract hood was found to have excessive housing temperature during certification testing. By adding insulation layers and optimizing airflow design, the temperature was reduced to within limits, achieving certification.
Down-draft System: An installation method where the air intake is located on the side or below the cooking appliance, typically used in island kitchens or scenarios without overhead cabinets. The standard update requires heating tests for such installations to simulate the impact of hot airflows on the product's electrical components during actual cooking.
Remote Operation Requirements: With the popularity of smart homes, kitchen extract hoods can be switched on or off remotely via Wi-Fi or Bluetooth. Clauses such as 22.40 require assessment of risks such as remote command loss or false triggering, ensuring that safety is maintained even in the event of communication failure. For example, a certain model maintains a safe state after remote shutdown, remaining closed even if the network is disconnected.
Manufacturers should pay special attention to the following implementation points:
From the fifth edition to the sixth edition, the standard reflects the transition of kitchen extract hood products from single-function to intelligent and diverse installation methods. The new requirements for down-draft systems fill gaps in the standard; the introduction of surface temperature limits aligns with the general requirements of IEC 60335-1:2020; and the remote operation clauses adapt to IoT trends. These changes make the standard more forward-looking and applicable, and also help reduce safety accidents caused by improper installation or use.
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Update:
Tue, 14 Jul 2026 03:36:04 +0000