The IQAir Air Purifier series have been recommended by many professional reviewers.
With stronger fan, better HEPA filter and lower noise than most manufacturer's products, it's designed for those who are really serious about cleaning the air in their home from contaminant.
Not as cheap as others, but if you have the money - or serious needs, check it out.

IQAir HealthPro Plus.
RATING: 
Control gases and odors.
Control light tobacco smoke.
Control normal household pollutants.
1 prefilter, 1 HEPA filter, 1 gas-odor filter.
Read full review
AREA : up to 1100 sq ft

IQAir HealthPro.
RATING: 
Control normal household pollutants.
1 prefilter, 1 HEPA filter.
Read full review 
AREA : up to 1100 sq ft
 
IQAir HealthPro Compact Plus.
RATING: 
Control gases and odors.
Control light tobacco smoke.
Control normal household pollutants.
1 prefilter/gas filter, 1 HEPA.
Read full review
AREA : up to 900 sq ft

IQAir HealthPro Compact.
RATING: 
Control normal household pollutants.
1 prefilter, 1 HEPA.
Read full review 
AREA : up to 900 sq ft
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