Unit coolers, also referred to as evaporators, are CSA (C/US) Certified for hazardous (Classified) locations: * Class I, Division 2, Groups B, C, D, or * Class I, Division 1, Groups C, D Condensing units up to 20 tons are CSA (C/US) Certified for Class I, Division 2, Groups B, C, D hazardous (Classified) locations. Explosion proof Unit coolers are low and medium temperature fan-forced refrigeration evaporators typically for use in hazardous chemical storage rooms. These are coupled with a remote-mounted condensing unit. A complete system can be provided with an explosion proof thermostat or with Nema 4 temperature controls (to be purged or installed in an unclassified location.) Marc Climatic can explosion proof customer-supplied unit coolers or condensing units. Many popular brands will then carry the CSA certification upon completion of our work. We can receive your unit direct from the factory, explosion proof it, and ship it to your job site or warehouse. Call us for pricing to explosion proof your equipment.