Many industrial facilities operate in areas classified as hazardous because flammable gases or vapors might be present. International standards (ATEX, IECEx and NEC 500/505) divide these areas into zones based on how likely explosive atmospheres are to occur: Zone 1 has flammable gases/vapors present during normal operations, whereas Zone 2 only sees these atmospheres briefly. In North America, Class 1 locations are further divided into Groups A–D depending on the specific gas; Group C covers gases like ethylene and ether, while Group D includes acetone, ammonia, gasoline, propane and other common hydrocarbons. Explosion‑proof HVAC systems are essential in such environments because traditional air conditioners can create sparks or high surface temperatures.
Why explosion‑proof units?
Explosion‑proof air‑conditioning units and heat pumps are engineered to mitigate ignition risks. Their key features include:
-
Encapsulated electrical components – critical components such as relays, compressors and fans are housed in flame‑proof enclosures.
-
Corrosion‑resistant construction – hazardous sites often expose equipment to chemicals, moisture and salt; explosion‑proof units use stainless steel or aluminium to protect against corrosion.
-
Compliance with ATEX/IECEx/NEC standards – these units are certified for global hazardous‑location regulations.
-
Non‑sparking motors and sealed refrigerant circuits – fans and motors are designed to prevent sparking, and refrigerant lines are sealed to avoid leaks.
-
Optional corrosion coatings – for offshore or chemical plants, additional coatings can be applied to the cabinet, coil and fins. Marine‑type units use corrosion‑proof coated cases and copper tubes/fins, ensuring durability in salty or chemical environments.
These safety features allow certified units to operate safely in Zone 1 and Zone 2 areas and in Class 1, Division 1 or 2, Groups B–D under NEC rules. Such certification makes them suitable for oil & gas platforms, refineries, chemical plants, ammunition storage and other high‑risk sites.
Flexible designs to suit your facility
Explosion‑proof HVAC systems are available in multiple configurations to match different spaces and installation constraints. Your facility can choose from:
