Question:

I change our furnace filter a few months ago. Today, when I went to change it the filter in the furnace was perfectly clean. Why wouldn't it be dirty like usual? Thanks, Mark

Answer:

Not sure why it is not dirty, when you take the filter out of the rack, and turn on the furnace, do you feel air moving past the cold air return? Have you had a duct cleaning recently? Maybe it is good for a few more months.

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