It is a small light weight unit made out of aluminium and built into a rigid steel frame. The unit is designed to operate on COLPRO applications with the evaporator module placed inside the shelter and the condenser module placed outside. The two modules are interconnected by 5m long refrigerant hoses, power and control cables. The interconnections are all equipped with quick disconnect components for quick and safe setup and take down. The HVAC unit can also operate with both modules placed outside, with supply air and return air ducted to one tent. A dual filtration system for the internal air path is available for selective filtration.

The function of the ACM 18 CBRN is based on a cooling circuit and two powerful fans. The evaporator section contains the evaporator and a radial fan, which draws warm internal air of the tent through the cold evaporator and blows out the cooled air either through the side or top of the unit. The condenser section contains two condenser coils and a large axial fan, returning the heat taken from the internal air to the outside atmosphere. The ACM 18 CBRN can be equipped with an electric heating coil, to provide heating for example for night time when temperatures can fall under 20°C. All sheet metal parts are protected against corrosion by a minimum 80μm top coat.