Diffusor apparatus

In order to overcome the problems that earlier apparatus have experienced, in particular in order to provide for a diffuser apparatus constructed to provide an even, uniform airflow velocity across hundred percent of a heat exchanger (30), a diffuser apparatus (10) for a space (12) of a refrigeration container (14) comprises - a housing (18) having an internal chamber (20) extending to a nozzle portion (32) comprising a height less than a height of the internal chamber (20) and a width greater than a width of the internal chamber (20), - a fan (22) disposed for operation in the internal chamber (20), and - the heat exchanger (30) disposed for operation in the internal chamber (20) between the fan (22) and the nozzle portion (32).