@suetanvil@freeradical.zone @Texan_Reverend@kind.social thanks for this! If you have an airborne particulates sensor and a stick of incense, you can see that without the CR box particle counts go up rapidly and can stay in the air for like 18 hours after emission, but with the CR box running, levels are kept low and clear out to nothing within a few hours. Tip #1: having 2" thick filters dramatically increases airflow. Tip #2: if you have pets, simply wrap the CR box in a bug screen like you'd use for a window - cut to size and tape that in place over the filter, and they won't damage the it by scratching