AAF, in conjunction with its sister company McQuay, markets a full range of refrigeration systems including Mechanical and Absorption Chillers. Inlet air is normally cooled by passing it through a finned coil (of tubes) and the air temperature must not be less than 5°C (41°F) to avoid ice formation on the coil. Refrigeration will always provide the design inlet temperature regardless of the ambient conditions, unlike the evaporative systems which lose effectiveness in high humidity conditions.