Regarding power consumption, the calculation seems to assume you run the thing constantly. Is it a mistake to run these things constantly? Presumably if it does

Regarding power consumption, the calculation seems to assume you run the thing constantly. Is it a mistake to run these things constantly? Presumably if it does that good a job pulling out incense, and if you're not constantly smoking or burning stuff, and you're in a reasonably sealed building (and if those assumptions don't hold, why would a filter help?), you should be able to get most of the benefit from only turning it on when something has added a bunch of particulate matter (like, you're cooking or cleaning, or you opened the window and there's pollen out)?