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Explosion proof enclosure cooling

12 January 2021

If the enclosure is an ATEX zoned area, the thermal management components need to be explosion-proof. We offer ATEX certified fans to cool the enclosure whilst protecting equipment from the ingress of dust and water.

Environments in which there is a risk of explosion pose a number of challenges in terms of protecting vital equipment, whilst ensuring all components adhere to legislation and meet the requirements of the setting. Such hazardous environments include industrial refineries, chemical plants, offshore platforms, food production gas plants and refrigeration applications. Protecting equipment in these settings often means enclosing it. This applies to not only electronic equipment but also control and automation equipment such as switchgear and drives.

As these enclosures need ventilation and cooling to prevent overheating or corrosion, a solution has been developed that meets these demands whilst conforming to the EU ATEX directive and preventing the ingress of dust and water. Axair’s HEC range of explosion proof EC compact axial fans have been specially designed for control panels and enclosures, but are also ideal for refrigeration, where hydrocarbon refrigerants may be present, and any other ATEX zoned environments.
The fans incorporate a fully encapsulated motor and spark proof components. They do not spark due to a short-circuit and can safely control the surface temperature within the range of safety. This prevents any ignition or explosion and offers a safe solution. The compact axial itself is constructed using ball bearings, increasing the lifespan of the product, thus, making it more cost effective. The HEC range is ATEX certified for Zone 2. This applies to settings where potentially flammable gases or vapours are present abnormally. This means an area in which an explosive mixture is not likely to occur in normal operation and if it occurs it will exist only for a short time, for example, a gas leakage or chemical spill.

In harsh sites, enclosures need to protect equipment from the ingress of dust and water that may occur given the nature of the processes and the environment outside the enclosure. Axair’s HEC range is rated to IP68; the highest level of protection possible. This rating means that the enclosure is ventilated and cooled with no ingress of dust and protection against the effects of immersion in water under pressure for long periods.

Further to the advantageous ingress protection, the HEC range also benefits from an EC motor. EC motors deliver very high efficiency even at low speeds due to the reduction in motor slippage. An EC motor can save the user over 80% in energy costs over its AC counterpart. They are simple to connect and control, individually preconfigured, compact in design and have a high power density. The compact design is crucial for enclosures that have very limited space. The motor operating temperature is lower, giving the fan a longer lifetime than an AC equivalent.

The HEC range is available in an industry standard size and three speeds for a wider range of air flows and applications.

If you are not sure whether you need an explosion proof ATEX fan or need to know the ATEX zone in which your application is classified, please consult an official authority.

To buy online, visit or to discuss your application, call 01782 349 430 or email

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