Features NIKKEN POWERS BRAND A BRAND B BRAND C BRAND D BRAND E BRAND F Coverage, square feet* 450 350 1,000-3,000 233 600 510 room HEPA filtration X     X   X   Multi-stage filtration X X   X X   X Negative-ion generation X     X X   X No-ozone operation X             Ultraviolet light not neccessary   X       X Smoke reduction X X X X X X X Pet dander reduction X X X X X X X Mold spore reduction X X X X X X X Aromatherapy module X             Multiple settings with extended run time X X   X X X X Safety shutoff X     X X     Automatic breeze control X     X       Filter replace indicator light X X   X   X X Remote control X X   X       Quiet operation X X         X Lightweight design X           X *Result of testing conducted by the FCG Research Institute laboratories, using JEM1467 Standard of the Japan Electrical Manufacturers Association, Testing for Air Cleaner Products.