Point to consider
- Of primary concern are the other aspects of air cleaners including hazardous gaseous byproducts, noise level, frequency of filter replacement, and electrical consumption. Ozone production is typical of air-ionizing purifiers. Although a high concentration of ozone is dangerous, most air ionizers produce low amounts (<0.05 ppm). Frequency of filter replacement and electrical consumption are the major operation costs for any purifier.
- HEPA technology is used in portable air purifiers as it removes common airborne allergens. The HEPA specification requires removal of at least 99.97 percent of 0.3 micrometer airborne pollutants. Products that claim to be HEPA-type, HEPA-like or 99 percent HEPA do not satisfy these requirements and may not have been tested in independent laboratories.
MERV : Minimum Efficiency Reporting Value (MERV) is a standard that rates the overall effectiveness of air filters, specifically large purifiers intended to clean an entire house or building. Higher-value MERV rating equates to finer filtration, meaning fewer dust particles and other airborne contaminants can pass through the filter.
CADR: The clean air delivery rate tells you the volume of filtered air that the device can blow out. This is critical because a higher CADR number is what you are looking for.
ACH: This stands for air changes per hour. Each purifier comes with a room size rating. What is important is how quickly the purifier can change all of the air in that given space per hour. ACH rating of six to eight is a must.
CFM: The cubic feet per minute measures how many cubic feet of air move through the unit per minute. You need a higher CFM.