Our F3 High Airflow filters provide up to 99.9% filtration from airborne particulates down to .1 micron while also reducing odors. In addition, they provide 40% better breathability than the standard RZ F1 Filter. We are currently out of stock on the F3 filters and anticipate having more available as soon as possible. Sign up for our newsletter below to be the first to know when they’re available to purchase. Thanks for your patience.