Shark NeverChange Air Purifier MAX, saves you $300 or more in filter replacement costs over 5 years. Covers up to 1400 sq. ft., for powerful, multi-room purification. Odor Neutralizer Technology guards against odors throughout your home, releasing a fresh scent. A HEPA filter captures 99.98% of particles. Vs. cost of replacing filters on a competitor unit over 5-year period in 300 sq ft space.