Choose a convenient time to open a window, and consider the weather and the way your room is arranged.

Make a note of which rooms you aired and when. A simple calendar reminder is often enough.

Check the device’s filter instructions before changing a cartridge. Keep the replacement dry until it is needed.

If you use a subscription, pick a rhythm that suits your calendar: every 3, 6 or 12 months.

Close the window when you are ready, then return the purifier to its usual place with clear space around it.