Best...because it removes microscopic Dust particles as small as 3/10 micron, because it maintains it's efficiency and air flow capacity for a full year, because it has the exclusive DustGuard Air Seal which prevents any dust-laden air from bypassing the filter, because it NEVER needs cleaning - washing or vacuuming, because it has the "Only One Year Unconditional Money Back Guarantee"
Most Affordable...because it cost less than $50.00 for a full year of Clean Air Comfort
