
What you like: You can leave it on in the car at work all day. low tone Beautifully elaborate. The packaging was iphone quality. Improvement: Adjustable power. I want to have a high flow setting that I can use while the car is in motion. More ventilation holes. Summary: For high pollution areas, this filter isn't enough if that's what you're looking for. For the price it is very well made. It's almost like a work of art. I want to increase the attraction of the fans. I would be willing to pay more for that. The filter is massive and can handle a lot more airflow. This is a passive low pass filter.

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