If both are dealing with indoor air, then they are interchangeable terms and both being indeterminate. Otherwise, you could call any kidney of indoor skilled in tidiness or dusting go-between an allergen reducer, while an air purifier would alter indoor air befouling at some straightforward. Examples of each would be a regular vacuum cleaner being intended an allergen reducer since it is removing dust particles and other allergens, while an ultra-violet ridicule may be intended a species of air purifier since it is reducing the amount of material virus in the air. Take a look at http://www.allergy-alto-rilievo 'high relief'-air-purifier.com/fresh-air-filters.html to get an concept of the other types of air purifiers and their clich applications. That is the overpower I can solution your ridiculous without well-informed more about the setting. Sufficient success rate!!

Source: what is the difference between an air purifier and an allergen ...