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Honeywell Brochure 2c



Honeywell Brochure 2d





enviracaire HEPA Air Cleaner

#1 Choice of Physicians*

* Riter Research Inc. "Portable Room Air Cleaners Physician Preference Study"

How Can You Measure Air Cleaner Performance?

Air cleaner particle removing performance is determined by two important factors: filter effectiveness and air circulation capacity.

Filter Effectiveness

Filter effectiveness is the percentage of particles that the filter removes from the air that passes through it. Honeywell HEPA filters provide a minimum effectiveness of 99.97% in filtering out particles of 0.3 micron size from the air that passes through it. Particles of 0.3 micron size are the most difficult to remove from the air, and are used specifically in testing true HEPA filters.

To assure that incoming air does not leak around the HEPA filter, Honeywell HEPA filters are quality constructed with a sealed air flow system. Honeywell's Surround Seal - HEPA filter technology assures that virtually all of the air that is drawn into the air cleaner passes through the HEPA filter.

Air Circulation Capacity

The second most important factor in air cleaner performance is its air circulation capacity - the amount of air drawn through the filter. Air circulation capacity is measured in Air Changes per Hour (ACED). Each air change represents circulating the volume of air in the room through the air cleaner one time. All of the air in the room will not immediately be processed through the filter. However, the more air circulated through the filter, the more air cleaned.

 Air circulation capacity determines the particular room size for which the air cleaner is appropriate. While many air cleaners are rated on 3 air changes per hour, Honeywell recommends its room sizes based on 6 air changes per hour. This more stringent standard for selecting the correct air cleaner for your room size may be more appropriate for allergy and asthma sufferers who may require more effective air cleaning performance.

Selection Guide. Indoor air must be constantly recirculated by an air cleaner in order for it to effectively reduce concentrations of airborne particulate contamination. For air cleaners of equivalent filter effectiveness, a higher Air Change per Hour (ACH) rating helps improve air quality more quickly. Use the chart to the right to find the room size recommended for this model.

Typical Performance for this Model

Room Size

(8' ceiling)

Square Feet

Air Changes

per hour


14' x 19'



Honeywell minimum recommendation: 6 air changes per hour.

16' x 20'



17' x 22'



19' x 23'



Patented 360 degree Air Intake and Discharge

Patented 360 degree air intake and discharge enhances air cleaning efficiency. As shown by the diagram, room air is drawn into the air cleaner from all directions. The clean, filtered air is then distributed back into the room in all directions. This airflow promotes recirculation of the air in the room, so more air may be treated by the air cleaner.

How To Compare with Other Air Cleaners

In order to assist consumers in comparing room air cleaners, the Association of Home Appliance Manufacturers (AHAM) has developed a rating system, called the Clean Air Delivery Rate (CADR), to measure air cleaner effectiveness. These ratings are based on independent laboratory testing. Listed below are the CADR ratings for this model. These performance ratings are based exclusively on use with a genuine Honeywell true HEPA filter and activated carbon pre-filter.

Honeywell HEPA Model 13520

AHAM Air Cleaners Performance

450 Square Foot Room Size (18' x 25')

Dust 275

Tobacco Smoke 287

Pollen 251

The CADR values represent the performance that can be expected within the first 72 hours of operation. Subsequent performance may vary with use. Room size ratings conform to the AHAM Certification Program criteria of 80% smoke reduction. Higher Clean Air Delivery Rates (CADR's) provide improved performance in all room sizes. Portable air cleaners will be much more effective in rooms where all doors and windows are closed.



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Last modified: March 11, 2017