Maintain air quality with standard HEPA 4-stage filtration. Certified Bronze by the Carpet and Rug Institute's (CRI) Seal of Approval program. Operating at below 70 dBA, this vacuum is also LEED qualifying. Rotationally-molded polyethylene construction and PPO/polystyrene blend base. Maximize operator productivity with easy operation, adjustable handle and easy-to-maneuver low-profile design. Adjustable handle can be set at perfect height for operator and folded down for easy storage.