National Geographic : 2013 Jun
2 Tier RadialTM cyclones Why two tiers are better than one. The new DC50 has 2 Tier RadialTM cyclones that exert over 135,000 G of centrifugal force to capture micro- scopic dust particles. Its cleanerhead has nylon bristles for deep cleaning on carpets and anti-static carbon fiber filaments to remove fine dust from hard floors. To get the full story, visit dyson.com/DC50. Two tiers of cyclones capture more microscopic dust than any other.