Furnace Filters

What is a furnace filter?

It is an air filter used for improving the quality of air that is heated by furnace heat exchangers.

Why should the heated air be filtered?

1. The air coming out of the furnace frequently contains particles that have not burned completely suspended in it, these particles might aggravate allergies and on the long run might be a risk for other more serious problems.
   
2. The heated air contains pollen, mold spores and other particles that might be allergenic.
   
3. These suspended substances eventually clog the pores or openings of the heat exchanger in the furnace, that is why a filter is needed and that filter should be changed periodically.When the openings of the heat exchanger are blocked, the furnace will spend more energy to produce the desired heating.

Working of furnace filters

Like other air filters, there are many types of furnace filters with different mechanisms for purifying the air, however the general idea is to provide a barrier that will only let air through while blocking the particles suspended in the air. The furnace filters are usually made of heat durable material.