For any air purifier, it is most important to locate it near the most activity or traffic flow so that there is plenty of air circulation around the air filter. This will increase the air exchange rate and make the air cleaning more efficient. With a HEPA filter, it is best to locate it near an open area to ensure air movement all around. For an ozone air purifier,you should try to locate unit higher rather than lower, since ozone molecules are heavier than oxygen and will tend to drift downward. The same logic applies to ionic air purifiers, which release charged particles into the air.

If your air purifier unit is relatively portable and you have someone in the room who is a heavy smoker, move the air purifier a bit closer to him or her if this is practical (and if it won't mortally offend them!). You may also want, on occasion, to move the air purifier to a specific room when you have a particular odor to get rid of (you burned dinner, etc.).

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