The internal fan arrangement of an air handling unit is reconfigured by discharging directly from the scroll (12-1) into a 90 DEG elbow (42). The bend (42-3) of the elbow defines a converging section terminating in a throat (42-4) which leads to a diverging section. Additionally, an active noise control structure is located in the elbow with the noise sensing microphones (16) being located at or near the fan outlet.