Most physicians will confirm that an allergy air purifier is an essential part of an effective management plan for those whose condition is triggered by airborne allergens. But in order to be effective it should have the following 5 features.
Filter For Particles—Many of the irritants that trigger airborne particles are found in the air. Seasonal pollens, dust, dust mites, mold and mildew spores, and pet dander can trigger symptoms and even a flare up for those who have allergies.
HEPA or high efficiency particle arresting filters can successfully eliminate airborne particulates that are as small as .3 microns in size. This includes all of the triggers listed above. However, many of these solids can be eliminated by filters with bigger openings and that are far less expensive.
Pre-filters are made of a cotton ball sort of material and can trap the bigger particles in the air that can be seen with the naked eye. Having these filters as part of the filtration system can prolong the life of the HEPA which will save you time and money down the road.