How long should you run an air purifier?
For best results, air purifiers should be run continuously. In addition to creating cleaner air, continuously running an air purifier will have the added bonus of resulting in less household surface dust. It does not mean you'll be freed from chores completely, however, and it will still be necessary to vacuum and dust as needed. When cleaning day finally does roll around, be sure to run your air purifier at its highest setting until you finish since the activity of dusting and vacuuming stirs up particulates in the air.
How to care for your air purifier?
Keeping the air purifier clean and running smoothly is also important. Most models feature service lights that signal when filters need to be changed. Some indicator lights will go on when the filters are dirty and full of particles, others, however will light up automatically after running for a manufacturer-designated period of time.
Whether the unit features an indicator light or not, you should remove and clean the collector plate in an electronic precipitator air cleaner on a monthly basis. This can be done by washing the plate in a tub or sink or in some cases putting it in the dishwasher. Be sure to read the instructions that come with your machine.
HEPA filters should be changed on an annual basis.
At best, clogged filters or collector plates decrease the efficiency of air purifiers and at worst they can damage the machine, which makes regular cleaning of the filter or plate essential.