Which furnace filter should I use?

During cold weather, many people think of the furnace as a valuable home heating appliance. It is should also be an effective air cleaner, but that partly depends on your choice of filters. Basic furnace air filters prevent large particles from gradually clogging up and impairing the home heating and air conditioning system. Advanced filters protect both the furnace as well as your household’s respiratory health. Filters with high MERV ratings will give superior air filtration.

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