Austin Air Bedroom Machine Air Purifier B402A1 - SandstoneThe Bedroom Machine addresses the complete spectrum of air cleaning, removing sub micron particles, noxious gases and chemicals. Austin Airs 360 degree intake system draws air into all sides of the The Bedroom Machine, passing it through a 5 stage filter. The result, more clean air delivered faster and more efficiently than any other air cleaner on the market. STAGE 1 Large Particle Pre filter Removes particles easily seen by the naked eye (e. g.