The design of this filter was actually slightly better than the last filter I used, with ribbed sides all around making it more durable. The last filter I used had an arrow and said "This side is up" which was very clear; However, this filter had an arrow that said "Airflow" which is a bit more ambiguous. Not knowing which way the air was flowing through the filter, I looked at the old filter and noticed that the air was coming from the side where the old filter was the dirtiest. I finally figured it out, but the arrow that says "This Page Is Up" is a lot less ambiguous.
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