... more Air PurifierDESCRIPTIONS 1. Clean air with ionisation. A constant stream of harmless negative ions trap polluted ... technique as Whisper mode, with the addition of a built in fan, which increases air circulation. 3 ... at least 2 ft (30cm) away from a wall or any other large object. Place the unit ... technique as Whisper mode, with the addition of a built in fan, which increases air circulation.CLEANING ...