| CPC F24F 11/89 (2018.01) [F24F 13/20 (2013.01); F24F 2110/64 (2018.01)] | 13 Claims |

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1. An air conditioner comprising:
a cabinet including a first side having a first through hole and a second side having a second through hole;
a pipe formed to pass through the first through hole;
a sensor kit provided on the second side; and
a controller to be electrically connected to the sensor kit,
wherein the sensor kit comprises:
a sensor configured to sense a pollution level of outside air;
a cover formed to cover the second through hole on the second side, and fix the sensor; and
a holder formed to fix the cover to the second side, and
the holder comprises a communicating hole formed in one side of the holder,
wherein the cover comprises a coupling portion formed to pass through the second through hole, and
the holder is positioned inside the cabinet and coupled with the coupling portion.
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