AmazingAir 3500 4-in-1 Air Purifier + 1 year Filter Combo PackThe AmazingAir 3500 + 1 Year Filter Combo Pack gives you everything you need for more than one full year of cleaner, healthier air. Right out of the box, youll receive the AmazingAir 3500 with its complete starter package: 1 UltraHEPA filter and 1 Carbon Gas Trap VOC filter (with Pre Filter attached)plus the purifier itself. From the very first use, youll enjoy advanced 3 stage filtration. The UltraHEPA captures 99. 99% of particles as small as 0. 003