Mixer assembly for an aircraft air conditioning system, comprising: - a plurality of fresh air lines (12, 18), which are adapted to be flowed-through with cold fresh air during operation of the mixer assembly, - a first and a second recirculation air line (24, 30), which are adapted to be flowed through with recirculation air discharged from an aircraft cabin during operation of the mixer assembly, - a first premixer, which is connected to at least one fresh air line and at least one recirculation air line and is adapted to mix the fresh air conveyed through the fresh air line into the first premixer with the recirculation air conveyed through the first recirculation air line into the first premixer, - a second premixer, which is connected to at least one fresh air line and at least one recirculation air line and is adapted to mix the fresh air conveyed through the fresh air line into the second premixer with the recirculation air conveyed through the recirculation air line into the second premixer, - a main mixer, which is connected by a first premixed air line to the first premixer and by a second premixed air line to the second premixer, wherein the main mixer is adapted to be supplied through the first premixed air line and the second premixed air line exclusively with premixed air from the first and/or the second premixer (16, 22), characterized in that the mixer assembly further comprises: - a first filter device disposed in the first recirculation air line, and - a second filter device disposed in the second recirculation air line, and a first connection line, which branches off from the first recirculation air line downstream of the first filter device disposed in the first recirculation air line and opens out into the second recirculation air line downstream of the second filter device disposed in the second recirculation air line. - a plurality of fresh air lines (12, 18), which are adapted to be flowed-through with cold fresh air during operation of the mixer assembly, - a first and a second recirculation air line (24, 30), which are adapted to be flowed through with recirculation air discharged from an aircraft cabin during operation of the mixer assembly, - a first premixer, which is connected to at least one fresh air line and at least one recirculation air line and is adapted to mix the fresh air conveyed through the fresh air line into the first premixer with the recirculation air conveyed through the first recirculation air line into the first premixer, - a second premixer, which is connected to at least one fresh air line and at least one recirculation air line and is adapted to mix the fresh air conveyed through the fresh air line into the second premixer with the recirculation air conveyed through the recirculation air line into the second premixer, - a main mixer, which is connected by a first premixed air line to the first premixer and by a second premixed air line to the second premixer, wherein the main mixer is adapted to be supplied through the first premixed air line and the second premixed air line exclusively with premixed air from the first and/or the second premixer (16, 22), - a first filter device disposed in the first recirculation air line, and - a second filter device disposed in the second recirculation air line, and a first connection line, which branches off from the first recirculation air line downstream of the first filter device disposed in the first recirculation air line and opens out into the second recirculation air line downstream of the second filter device disposed in the second recirculation air line.