HEPA filter with anti-viral coating, 360 degree filtration, best for allergies and flu, efficiency level of 99.97% at 0.3 micron, captures airborne allergens and viruses including the H1N1 flu virus, for use with the Z-2000 & Z-2500 Air Purifiers. Help protect your family from the flu and year-round allergies with this all-in-one air purifier filter system. This combination filter has 3 levels of filtration to defend against flu viruses and pollutants in the air; a durable mesh pre-filter, an anti-viral HEPA filter and an activated carbon pellet filter. The filter drum is at the core of purifying your air as it captures 99.97% of airborne allergens and viruses, including the H1N1 virus. Help protect your family from the flu, hay fever and year-round allergies with 360 degree filtration drawing in air from all directions, collecting microscopic particles, pollen, dust, odour, allergens and VOCs. Indicator light glows red on the air purifier when the filter needs to be replaced, for b