The replacement HEPA filter with antiviral coating has an efficiency level of 99.97 Percent at 0.3 micron, purifying your air as it captures airborne allergens and viruses, including the H1N1 flu 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 Compatible with Leitz TruSens Z-1000 air purifier for home, indicator light glows red on the air purifier when the filter needs to be replaced, for best results it's recommended to replace the filter drum every 12 months This 3-in-1 HEPA filter drum 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 Contents: Leitz Trusens replacement air filter 1 x Mesh Prefilter, 1 x HEPA filter, 1 x Carbon filter for Leitz Trusens Z-1000 air purifier , dimensions (W x H): 16.95 x 8.32 cm,2415115, Weight: 0.7936641432 pounds, Manufacturer: Leitz