Box opened item never used New Blueair Blue Max 3250i Air Purifier The Blueair Blue Max 3250i Air Purifier uses HEPASilent Technology to provide clean air in any room, with a power consumption ranging from 2.5 to 20 watts. This portable unit, with a sleek grey design, is designed for freestanding use and operates quietly with a sound rating of 18-46 dB(A). With a compact depth and height of 269mm and 481mm respectively, this air purifier is lightweight at 3.39kg and suitable for use in any room.