To be honest, people who say it limits airflow have to take it on their heads. No wonder an arrow shows the direction of airflow. This is my second time buying these filters. I think they do a good job BUT I don't think they can last a full year. I change mine about every six months. I also think the time depends on where you live and the condition of your environment (smoking, pets, etc.). The only negative is the steep price for each.
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