I changed the furnace filter yesterday. I put a new one in on September 14, 2020 which was during the time when Oregon was covered with smoke from many fires burning throughout the state. It had not been too long since the last change but with the polluted skies we had, it was necessary.
Yesterday, so some reason, I thought about changing the filter again. So the bottom filter had been installed Sept 14 so roughly 1 1/2 months. As you can see, from the comparison to the new one, it did it's job.
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