Allergy Furnace Filter

Allergy furnace filters can help to remove numerous common particles which make up typical indoor air pollution. They include pollen, dust mites, pet dander, pet hair, organic compounds, and chemicals from household products, including formaldehyde, chlorine, and toluene. Indoor air pollution can aggravate allergies and cause watering eyes, sneezing, and coughing.


Furnace filters are made of synthetic filters that combine the technologies of electrostatic air filtration and mechanical air filtration for optimum results. A gradient captures particles and minimizes air flow resistance simultaneously. As the air passes through, more particles are trapped. As the filter fills up with particulates, more and smaller particles are trapped, until the filter fills completely and must be changed (after a period of about three months).

Furnace filters are terrific for households with allergy and asthma sufferers. They are inexpensive and have proven to be very effective (over 90%) at catching dust, dander, and other larger particulates. The air filters come as pleated panels that are simply inserted into the filter opening of a household air conditioning unit. They do not use ionizers and they do not emit ozone in order to remove pollutants. There are some models of furnace filters that can be washed and reused, while others must be disposed of when they become clogged.

These filters consist of a simple (usually cardboard) frame and filter media. The frame holds the filter in place at the intake to the furnace or air conditioning system. Highly efficient furnace filters are made up of special synthetic filtration materials that provide both electrostatic and mechanical filtration for even better filtering results. These filters have a gradient layer that can capture particulates, but will not absorb moisture that could cause the growth of harmful molds and bacteria.

Picture: How a Furnace Filter Works


When you choose a furnace filter, learn what its minimum efficiency reporting value, or MERV is. The MERV is a rating of the filter’s ability of capturing particles sized between 0.3 and 10 microns in diameter. It is a helpful measure for comparing the performance of the different furnace filters you will choose from. The higher the MERV rating, the better the furnace filter is at capturing particles in this size range.

Furnace filters are easy to use, are very effective, and installation is very simple. You may not need any tools at all, unless you need a flat head screwdriver to turn the screws that hold the filter grill to your air intake in place. First, remove the old filter from the intake, being careful not to shake dust and dirt from it. It is probably best to have a plastic garbage bag handy to put it in before any dirt and dust can fall off. Then, remove any plastic or paper wrapping from the outside of the filter, and put it in place of the one you removed. Replace the grill to the air intake, and you’re done.

While furnace filters are great for removing particles from your home’s air supply, they can’t do it all. The ideal set-up is furnace filters used along with one or more indoor air purifiers to minimize allergens and other harmful substances in the air.

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