AHWGn type air supply unit belongs to the group of the devices intended mainly for the single-storey buildings with special consideration of those in which installation of ducts due to technological considerations is impossible or undesirable. The unit consists of two parts: internal and external. The construction of external part bases on the framework made of aluminum profiles. The casing consists of the “sandwich” type panels filled with the 45 mm thick mineral wool. Whereas internal part is the self-supporting construction. Series of types includes 2 sizes with efficiency from 2000 to 9000m3/h. Air processing is limited to the filtering, heating and cooling with using the ice water exchanger. System of throttling valves enables reirculation of removed air. Applied rotational diffuser enables regulation of air stream range.