I ordered another 4 inch filter which was actually 4 and 3/8 inch so didn't fit. I had to return it and try this one. This is a true 4" filter. I like that you can write the date on it so I remember when it's time to change (the date is written after the picture is taken). No - -- the picture is not upside down. This is the airflow of my filter. I haven't used it long enough to know how well it works.
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