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Hazardous Location Air-to-Air Heat Exchangers for Electrical Enclosures

The hazardous location of air-to-air heat exchangers listed above are certified for Class I Division 2 and ATEX environments, providing passive, closed-loop cooling for electrical enclosures where flammable gases, vapors, or combustible dusts are present.

Sealed internal and external air circuits pass heat out of the cabinet without the two airstreams ever mixing. No moving parts in the heat transfer element, no refrigerant, and no water connection required, eliminating the ignition sources and maintenance overhead of conventional cooling. Models carry UL, CSA, ATEX, and IECEx certifications covering Class I Div 2, Zone 1, and Zone 2 as applicable, in NEMA 4 and NEMA 4X ratings.

These hazloc units are the right choice when ambient air is cooler than the desired cabinet temperature. If ambient exceeds your target, see the hazardous location air-to-water units. All models are manufactured by Noren Industrial Thermal Management.

Browse Available Hazardous Location Air-to-Air Heat Exchangers

The following Noren models are available through Pelmar Engineering. Available products include:

Model selection depends on heat load (BTU/H), the difference between ambient and desired internal temperature, and enclosure dimensions. Each product page provides the detailed specifications needed for sizing.

Passive Cooling for Flammable Gas and Vapor Environments

In a Class I Division 2 or ATEX zone, every cooling component is a potential ignition source. Air-to-air heat exchangers remove that risk at the design level: no compressor, no refrigerant circuit, and no moving parts in the heat transfer element. The sealed closed loop also keeps the classified atmosphere out of the enclosure, protecting sensitive controls from gases, vapors, and dust.

These passive enclosure coolers are commonly specified for:

  • Oil and gas production and processing sites
  • Chemical processing plants
  • Offshore platforms
  • Wastewater treatment facilities

Want to Learn More?

Need Assistance Selecting a Hazardous Location Heat Exchanger?

Pelmar Engineering works with engineers, maintenance managers, and procurement teams across Canada to match air-to-air heat exchangers to site classifications and heat loads. Contact us at 1-888-754-6329 or Email: info@pelmareng.com.

Common Questions About Hazardous Location Air-to-Air Heat Exchangers

A passive air-to-air heat exchanger uses two sealed air circuits — one inside the enclosure and one outside — that pass heat from the internal air to the external air without the two airstreams ever mixing. There are no moving parts in the heat transfer element, no refrigerant, and no water connection, so the enclosure stays sealed against the classified atmosphere while heat is carried out continuously.

Air-to-air heat exchangers have no compressor, no refrigerant, and no moving parts, eliminating the ignition sources that would disqualify a standard air conditioner in a Class I Division 2 or ATEX environment. They also require far less maintenance. Where below-ambient cooling makes a refrigerant-based unit necessary, certified hazardous location air conditioners are available.

Class I Division 1 areas have flammable gases or vapours present under normal operation, while Division 2 areas only have them present under abnormal conditions such as a leak or equipment failure. These Noren air-to-air heat exchangers are certified for Class I Division 2, ATEX Zone 1, and Zone 2 as applicable — confirm your area classification against your site’s electrical drawings before selecting a unit.

Models are available with UL, CSA, ATEX, and IECEx certifications covering Class I Division 2, Zone 1, and Zone 2 classifications depending on the model selected. Confirm the specific certification your site classification requires before selecting a unit.

No. Air-to-air heat exchangers can only cool the enclosure down to ambient temperature, not below it. If your desired internal temperature is below ambient, a hazardous location air-to-water unit or a refrigerant-based solution is required.

Model selection depends on three inputs: your heat load in BTU/H, the difference between ambient temperature and your desired internal temperature, and your enclosure dimensions. The available temperature difference is critical, since an air-to-air unit relies on ambient air being cooler than the target. Each product page lists the specifications needed for sizing, and Pelmar Engineering can match a model to your figures — contact us with those values.

Very little. There are no refrigerants to recharge and no compressors to service — periodic cleaning of the heat transfer surfaces and inspection of the seals is typically all that is required, which is a key advantage over refrigerant-based cooling in remote or hard-to-service installations.

Models are available in NEMA 4 and NEMA 4X. NEMA 4X adds the corrosion resistance needed for chemical, marine, and outdoor installations, while NEMA 4 suits general dust and water protection in classified indoor areas.