Review on 🌬️ VIVOSUN 6 Inch 440 CFM Inline Duct Fan with 6"x18" Carbon Filter for Odor Control - Premium Australia Virgin Charcoal Included by Casey Stevens

I was very impressed with this fan and filter combo when I bought it 5 months ago, but in the last 2 months the airflow has dropped to less than 10% of normal. I removed the pre-filter, took the carbon filter out of my tent (not an easy feat), vacuumed it with my shop vacuum, blew it out with an air compressor, and hung it back up. The next day the airflow was back to about 50% of normal. 10% airflow or less! With other brands, it took over a year before I even noticed a drop in airflow. For the money I paid this filter is absolutely NOT worthy. I give two stars for the fan itself. The filter gets a big goose egg.