
The filter can only be installed one way, it cannot be installed incorrectly. When installed, the airflow arrows point up instead of down as they should. The airflow is in the wrong direction. The blue layer (antimicrobial) should be at the end of the airflow. I wrote to the manufacturer, got no answer. If the airflow wasn't in the wrong direction, this would be a great filter. The fit was perfect. PUREFLOW, please fix this issue.

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