Welcome to T3’s review of the Coway Airmega 350, a powerful and very efficient air purifier for larger rooms and open-plan environments. Here’s my review of the Coway Airmega 350. Coway Airmega 350 review: Price and availabilityIf you live in the UK, you an purchase the Coway Airmega 350 direct from Conway for a discounted price of £264.99 or visit Amazon where it’s selling for an RRP of £299.99. For the record, a new Airmega 350 filter at Amazon retails at a reasonable £69.99. Coway Airmega 350 review: Verdict(Image credit: Future)With its huge HEPA and carbon filtration system and very responsive sensor, the Coway Airmega 350 delivers powerful and reliable air purification for large rooms.