Dear Peter, There is no such thing as too much air movement. The more movement, the easier it is for the individual O3 molecules to travel to the various surfaces in the room. If you mean too much O3 you can adjust the O3 by reducing the time of treatment.When using a powerful machine for smaller projects you simply run the machine for less time. The problem arises when you try to use too small of a machine in too large of an area, as it will never achieve useful concentrations.