The Environmental Protection Agency of the United States ranks indoor air pollutants among the top five environmental health risks. Indoor air pollutants include particulate matter such as dust, smoke, pollen, animal hair, tobacco smoke, and cooking stove emissions. The home’s air can also be laden with harmful dust mites, molds, bacteria and viruses as well as the particles they produce. Gases from combustion processes (cooking, vehicles, tobacco) as well as from paints, varnishes, cleaning products and pesticides also contaminate the air. Usually, these products are easily removed by simply allowing fresh air from the exterior (i.e. ventilation). However, ventilation may be constrained by bad weather and external environmental pollution. It is in these cases that air purifiers come in handy. However, air purifiers are of all types. It is important for the customer to be able to effect an Air purifier review on his own in order to be able to make a purchase decision and be satisfied with the product. Air purifier ratings can be made using several clear criteria as follows:
1. Maximum Air Flow Rate
While purchasing an air purifier, the size of the room should be taken into account. Under normal circumstances, the entire air in a given room should go through the purifier at least twice per hour.
2. Cleaning Efficiency
This is the efficiency with which the purifier removes particulate matter. Two types of tests are done to quantify this: physical count of particulate matter in the air and Blood Agar Plate test. The consumer can gain access to performance evaluation reports of the air purifier (they can ask the seller) that detail the results of these tests.
3. Life of the filters
Most air purifiers are based on HEPA filters. HEPA filters, if operating alone, easily clogs up and needs frequent cleaning and replacement. On the other hand, if a pre-filter is present, it can remove the larger particles before the air reaches the HEPA filter, leaving the latter to deal with the smaller molecules. This prolongs the life of the HEPA filter.
4. Cost and availability of Replacement Filters
Before purchasing a purifier consider the cost of replacement filters. If they are too high, your equipment may not be economical enough to run in the long term.