Air purification can make a small amount of difference in stalling viruses, according to Burroughs, though few strategies offer complete protection. While bacteria, pollen and allergens are airborne risks, viruses mostly spread by touch. However, ultraviolet air purification systems do keep mold and fungi, both of which can aggravate the flu, from developing in your heating and cooling system.
Honeywell TrueUV Ultraviolet Treatment System
, about $285