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Before the introduction of IFD filters, many of the best air purifiers used HEPA filters. When Honeywell introduced IFD-based cleaners, they also introduced a washable permanent filter. As such, consumers may wonder about the IFD filter vs. HEPA filter and which is better. The answer is more complicated than it may seem initially. Read on to find out more. For additional information about the best air purifiers and humidifiers or the best air purifiers under $100, check out our guides.
Different air purifiers use purification technologies to reduce airborne particles in the indoor space with varying degrees of efficiency. HEPA filters remove about 99.97% of air particles larger than 0.3 microns in size. Meanwhile, IFD filters eliminate approximately 99.99% of microscopic particles. The two filter types differ in cost, consistency, noise, power consumption, and whether they need to be replaced. The biggest difference, though, is found in the process used to eliminate airborne contaminants.
HEPA-based air purifiers are less expensive right now because IFD filters are less common.
Honeywell introduced intense field dielectric (IFD) filters—permanent, reusable filters that can be washed. Because of this feature, the filter will not need replacing. They also consume less energy and make less noise. However, IFD-based air purifiers may cost more initially, and they produce ozone in small quantities. Although the initial amount of ozone is not harmful, you should not use an IFD permanent filter for an extended time without ventilating the room. Finally, they do not have a standard for filtration, so some models may not be as effective.
You should wash your filter every 2-3 months. And because this product includes a permanent filter, you have to put it back in the air purifier.
A Honeywell or Braun IFD filter removes particulates, such as dust mites, pollen, allergens, and mold spores, among other things. They accomplish this in a way similar to an ionic air purifier. IFD filters work with electrostatic precipitation devices that charge particles during the cleaning process, using electricity to remove pollutants. Then, the particles become attracted to the oppositely charged plate. In doing so, the appliance produces a small amount of ozone. Large amounts of ozone may cause respiratory problems.
High-efficiency particulate air (HEPA) filter-based air purifiers catch air pollution between the fiber of the filter. As a result, the particles stick to the fibers, effectively removing them from the air stream. You must change these filters every year or so, unlike the washable IFD filters. However, they also catch at least 99.97% of larger particles about 0.3 microns or bigger, though a MERV 20 is 99.999% efficient. HEPA air purifiers may be combined with another type of filter or air purifier, including an air ionizer or activated carbon filter.
Be sure to let the IFD air filters dry completely before replacing them to avoid injury.
Do air purifiers with IFD filters produce Ozone?
Air purifiers with IFD filters generate ozone through the electricity used to eliminate indoor air pollution.
Can you wash and reuse air purifier filters?
You can wash and reuse air purifier filters only if they are designed to be cleaned.
What is a true HEPA filter?
A true HEPA filter is the same as a HEPA filter. However, filters listed as “HEPA-type” or “almost HEPA” are not certified HEPA filters.
STAT: A MERV 20 filter is more than 99.999% efficient. (source)