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A 5-Minute Guide to the Most Common Furnace Filter Size and How to Choose Wisely Is there such a thing as "the most common furnace filter size," and if so, what is it? How do you choose the best furnace filter size without making costly returns? We'll tell you everything... A 5-Minute Guide to the Most Common Furnace Filter Size and How to Choose Wisely Is there such a thing as "the most common furnace filter size," and if so, what is it? How do you choose the best furnace filter size without making costly returns? We'll tell you everything...