Honeywell HHT-090 Hepa Review
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Moderately Priced Purifier for Small Rooms

The Honeywell HHT-090 is an effective air purifier for odors and most allergens. It has two permanent filters which can be cleaned as needed. It will work best in small rooms, can be used in a medium room, but is not recommended for use in large rooms. The claim of a HEPAClean filter is misleading, as it is not a true HEPA filter, but it will remove most household allergens.

Includes two filters

This model includes two permanent filters; the pre-filter catches larger particles while the HEPAClean filter captures particles as small as 2 microns, or about 1/100th of a human hair. True HEPA filters will filter particles as small as .3; most household allergens fall within the 2 micron range.

90+ CADR rating

The CADR rating is the industry’s standard measurement of effectiveness for tobacco smoke, dust, and pollen. With CADR ratings between 90-100 for tobacco, pollen, and dust, the Honeywell HHT-090 is ideal for small to medium-sized rooms, as it promises in advertising. The CADR rating should be no less than 2/3rds of the room size, so this model is best suited for rooms of 150 square feet or less.

HEPAClean Filter

The Honeywell HHT-90 has a HEPAClean filter; this is NOT the same as a HEPA filter. HEPA filters are regulated by the USDE and must remove at least 99.97% of air particulates. This model claims to remove 99% of particles, but this cannot be backed up by regulations.


Permanent filters

This model features permanent filters that will not need to be replaced, saving you money over time. You will be alerted by the electronic sensor when you need to clean the filters; you can clean them with your household vacuum cleaner. Never wash the HEPA filter in water, as this can damage it. You will have to be diligent about cleaning, as dirty filters will not effectively purify the air. It would be wise to clean the filters on a regular basis, regardless of whether or not the sensor alerts you that they need cleaning.

Odor control

The Honeywell HHT-090 includes an ionizer as well as antimicrobial agents on the filters to help reduce odor in your home. The antimicrobial agents kill microbes and bacteria that breed and cause foul smells; the ionizer works by sending ions into the room, which then attach themselves to oxygen particles and create particle clusters which can be sucked back into the purifier. These two features working in tandem have effective deodorizing power.



The Honeywell HHT-090 produces a louder noise than comparable units, even on lower settings. The medium setting is suitable for sleeping if you are used to white noise, but would be uncomfortable for watching TV.

Overall Review

The Honeywell HHT-090 is an effective air purifier for small rooms and is a laudable deodorizer as well. While it does not have a true HEPA filter, as the advertising would have you believe, it will eradicate the majority of allergens in your home. People with severe allergies or who want a true HEPA filter will need to look elsewhere, but typical allergy sufferers will find relief with the filtering power of the HHT-090. It is an effective deodorizer for homes with pets and smoke, as well as for normal household odors.