Filter hazards out of the air (allergens, smoke, mould, viruses)
As close as possible to the centre of the room
Away from walls, corners, open windows, supply vents
Away from obstructions like under a table/desk
Avoid blowing directly on someone
If you have multiple portable air cleaners space them out
Commercial store bought (often referred to as HEPA filters)
Avoid features like ionization, plasma, UV
Use ON setting instead of AUTO
Do it yourself Corsi-Rosenthal box
Corsi-Rosenthal Box Illustrated by Amanda Hu