Electrostatic filters make excellent furnace filters with decent air purifying capabilities to boot

Electrostatic filters can be found used as a pre-filter in various types of air purifiers, or they can act as a furnace filter in an air conditioning or central heating unit.

Electrostatic filters are made of fibers that get electrostatically charged as the air flows through them. The electrostatically charged fibers act like tiny magnets and can capture up to 30 times more pollen, pet dander, smoke, dust and other allergens than standard fiberglass filters.

The highest quality electrostatic filters approach the air cleaning capability of better quality air purifiers, but at a fraction of the price. However, electrostatic furnace filters do not remove odors and smoke.

There are basically two types of electrostatic filter – disposable, or permanent. The permanent electrostatic filters need to be cleaned regularly, otherwise they quickly become less effective.

Disposable electrostatic filters have to be replaced every 2 to 3 months. This is particularly the case with furnace filters. Because a clogged furnace filter diminishes the airflow to the furnace, it can not release it’s heat properly.
This in turn causes the feedback system to conclude that the heater is at the right temperature, and to shut down before the room is at the proper temperature. In the worst case a clogged electrostatic filter can damage the furnace.

Electrostatic filters can also be found in the form of pleated filters, and in this combination are at their most effective.

Most electrostatic filters are 1” thick, but some central heaters/air conditioning units accept pads up to 6” thick that are more effective.

Before you purchase an electrostatic filter for a furnace, make sure that you know what the required size is, because it can vary among different models.

If the required size can not be found in on the filter, or there is no filter in the unit, then you must measure the exact dimensions and subtract 3/8 inch from both the length and the width to establish what size filter to purchase. The 3/8 inch difference enables the filter to slide in the channels.

For more information on related products, please choose from the following:

Whole House Purifiers | Replacement Filters