Patent ID: 9396718
Filing Date: 2016-07-19
CPC Classification: B60H,F24F,G10K

Claim Text:
1. An air conditioning unit comprising an air duct comprising a diffuser arranged between a fan tongue of a fan and a heat exchanger inlet region of the air duct, a fan for conveying an airflow through the air duct, a heat exchanger for the thermal conditioning of the airflow, and an apparatus for noise reduction, which apparatus comprises a microphone, a loudspeaker and an evaluation and control unit, wherein the microphone is arranged in a housing indentation of the duct wall of the air duct, wherein the housing indentation comprises a wall, wherein the wall of the housing indentation is curved at least partially, wherein the housing indentation is covered with a porous acoustically transparent material, wherein the loudspeaker is arranged at least partially in an opening of the duct wall of the air duct in a manner which is spaced apart from the microphone in the direction of the noise emission, wherein the air duct has a width (x) and a height (h), wherein the diffuser is of a length (L) shorter than a length of the air duct, wherein length (L) is at least 10 cm, wherein over length (L) the diffuser has a relatively constant width (x) of at most 15 cm and has a height (h) of at most 20 cm, wherein over length (L) the height (h) is widened by at most 50%, wherein a height of the heat exchanger inlet region of the air duct is at least 100% greater than height (h).