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Which Unit Is Right For You?

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Three Types of Air Purifiers And Indoor Filtration Systems. 

What will a room air purifier do for each person as they breathe throughout the day? Since the average person inhales 62 pounds of air a day, your air purifier can potentially filter a significant percentage of this potentially unhealthy air for you. Since the same “average person” consumes nearly 4.4 pounds of water per day, you can quickly deduce the importance of your air purifier to bodily processes. This fact highlights how your room air purifier can de-limit or reduce one's susceptibility to air contaminates and pollution.

Table-Top Air Purifiers
Until recently, small, inexpensive, table top appliance-type air purifiers have typically been quite popular in terms of unit sales. They generally contain small panels of dry, loosely packed, low-density fiber filters upstream of a high-velocity fan.

Table top units may also consist of a fan and an electronic or other type of filter.

Room Units - Recommended
Another major type of residential unit is the larger, yet portable, devices designed to remove pollutants in a specific size room. Due to their larger and more effective filters or collecting plates, these larger portable filters are considerably more effective in removing pollutants in a room than the table top units (Consumer Reports, 1992; Fox, 1994) and have become increasingly popular in the past several years.

The highest efficiency for smoke and dust removal was observed in a room unit utilizing electrostatic precipitation. Portable room units are much more effective in rooms where all doors and windows are closed (AHAM).

Central Filtration Systems
Filtration systems can also be installed in the central heating or cooling systems of a residence or in an HVAC system. These units are commonly referred to as "in-duct" units, although this term is actually a misnomer since they are not located in the distribution ductwork, but rather in unducted return circulation grilles.

A review by Fox (1992) suggests that a highly efficient room unit will be more effective at removing pollutants in the room where it is located than a central filtration system. Consumer Reports (1992) also recommends that for removing pollutants in a room or several rooms, a portable filtration system is more effective than a central system.


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