The AirMaster AM 150, AM 300, and AM 500 are the smallest units in the ceiling mounted SMV range. All the SMVs in our range can have their sound pressure limited to 30 dB(A) for SEN classrooms in line with BB93 but are 35 dB(A) as standard. Each unit has a dry bulb heat recovery efficiency of 84 to 92% all without mixing or recirculation, and they can be equipped with filter grades PM10 75%, PM1 55% and PM1 80%.