last updated 21 Aug 2021

How they work: Pre-filter – The fabric pre-filter can catch the large particles. This pre-filter is washable or vacuumable. Particle filter – Instead of using a True HEPA filter, Blue Pure 121 uses a polypropylene fibers filter to help capture 99% of all allergens like dust, dust mites, pet dander, pollen and fungi (HEPA technology). Activated Carbon Filter – The Activated Carbon filter is added inside the Particle filter and effective against smoke, odors, gases and VOCs.

From: Dale
This is an article on air purifiers. - Other reviews say you need an activated charcoal filter for smoke & smell not just a HIPPA filter. In any case filters need to be changed regularly, an ongoing expense. Some say they will remove the larger smoke particles but not the smoke odor. Some ionizers produce ozone which is it's self a problem. I haven't looked up our Lasko fans to see if there is any comment on ozone from from them. We haven't used the ionizer other than a few times and it does tend to produce more dust on surfaces. It's not clear to me that it would be worth it for the cabin given the need for regular cleaning and filter changes. Some comments said that use with a dirty filter can be worse than no air purifier.


Cnet Comments: According to multiple researchers they talked to, most consumer air purifiers simply don't have enough activated carbon to be an effective odor filter for more than a short period of time.
Instead of using a True HEPA filter, Blue Pure 121 uses a polypropylene fibers filter to help capture 99% of all allergens like dust, dust mites, pet dander, pollen and fungi (HEPA technology).
Ionic Air Purifiers vs HEPA filters.
While there are a number of different types of ionic purifiers, the most common are electrostatic precipitators and air ionizers. Ionic Air Purifiers create release negatively charged ions into your air, and bind to the dirty particles, causing them to become too heavy to float. They fall out of the air, and settle onto surfaces in your home or collect on walls and TV screens.
Many don't have fans so they are quiet but only cover a small area around them.
They also create ozone which is a pollutant but also is an oxidant with germicidal effects. Most immunologists say the irritating effects are not worth it.

Electrostatic precipitators use positively and negatively charged plates to collect dirt and dust particles as they pass through the machine. A fan pulls the pollutants towards the electrostatically charged plates, and collects them.
You just clean the plates periodically.

Most immunologists recommend (HEPA) filters . The ultra-fine mesh on these filters traps all sorts of irritants