In Malaysia and globally, IECEx (International Electrotechnical Commission System for Certification to Standards Relating to Equipment for Use in Explosive Atmospheres) is the "gold standard" for safety in hazardous environments. Unlike the ATEX directive, which is a legal requirement specifically for the European Union, IECEx is an international certification scheme that ensures a uniform level of safety across borders.
For ventilation equipment—such as axial fans, centrifugal blowers, and portable ventilators—IECEx certification is more rigorous than ATEX because it prohibits self-certification. Every piece of IECEx equipment must be independently tested by an approved third party.
To earn an IECEx certificate, ventilation equipment must mitigate three primary ignition risks: Electrical arcs, Mechanical sparks, and Surface heat.
Non-Sparking Construction (ISO 80079-36/37): The impeller (fan blades) must be made of materials that do not produce a "grinding spark" if they strike the housing. Common materials include aluminum, copper-beryllium, or specialized anti-static composites.
Static Dissipation: The fan casing and blades must be conductive or treated with an anti-static coating to prevent the buildup of high-voltage static electricity, which can discharge as a spark.
Flameproof (Ex d) or Increased Safety (Ex e) Motors: The electrical motor must be housed in a certified enclosure that can either contain an internal explosion (Ex d) or prevent sparks and excessive heat from occurring in the first place (Ex e).
| Equipment Type | Typical Zone | Primary Use Case |
| Axial Duct Fans | Zone 1 & 2 | General exhaust or fresh air supply through long duct runs in refineries. |
| Centrifugal Blowers | Zone 1 & 2 | High-pressure extraction for chemical fumes or material handling (dust). |
| Portable Ventilators | Zone 0 & 1 | Confined space entry (e.g., cleaning fuel tanks or underground manholes). |
| Roof Extractors | Zone 2 | Large-scale warehouse ventilation for volatile organic compounds (VOCs). |
When inspecting an IECEx-rated fan, the nameplate provides a "DNA profile" of its safety capabilities. A typical marking might look like: Ex db IIB T4 Gb
Ex: Explosion protection symbol.
db: Protection method (e.g., d = Flameproof, e = Increased Safety).
IIB: Gas Group (e.g., IIA = Methane/Propane, IIB = Ethylene/Ethyl Ether, IIC = Hydrogen/Acetylene).
T4: Temperature Class. This indicates the maximum surface temperature (T4 = 135°C). The equipment T-rating must be lower than the auto-ignition temperature of the gas present.
Gb: Equipment Protection Level (EPL). Ga is for Zone 0, Gb for Zone 1, and Gc for Zone 2.
In Malaysia, the Department of Occupational Safety and Health (JKKP/DOSH) and SIRIM recognize IECEx as a primary means of demonstrating compliance with the Occupational Safety and Health (Use and Standards of Exposure of Chemicals Hazardous to Health) Regulations 2000.
Online Traceability: Every IECEx certificate is stored in a publicly accessible
Mandatory Audits: Manufacturers of IECEx equipment undergo periodic factory audits (Quality Assessment Reports - QAR) to ensure every unit produced is identical to the one that was tested.
Malaysia
