The HealthPro features the same advanced micro- and nano-particlefilter technologies as the HealthPro Plus however without the gas and odorfilter (V-5 Cell). The HealthPro effectively removes every type ofparticulate air pollutants including all common allergens. The system has aspare compartment that can at any time be upgraded with a the V-5 Cell(wide-spectrum gas and molecular filter) to help eliminate gaseous chemicalsand odors. This makes the HealthPro the ideal choice for allergy sufferersand other health-conscious individuals that need ultra high-efficiencyparticle removal with the option of later adding gas and odor removal. Mostair purifiers only filter particles larger than 0.3 microns in size but 90%of all ultra fine particles are smaller than 0.3 microns. This means thatmost air purifiers are only filtering 10% of the particles in your air.IQAirs patented HyperHEPA filters are the first filters tested and certified to filter down to 0.003 microns with a guaranteed minimum efficiency of over 99.5%. This allows your HealthPro to capture the ultra fine particles that other air purifiers miss.