How are the negative ion generators tested?
The negative ion output is tested by the manufacturer by using more than one method. These testing methods of the ion output are proprietary. However, the advertised ion output figures are accurate to within 5% of all testing methods. The manufacturer does not publish ions per cubic centimeter figures, because that varies greatly with the distance from the emitter, humidity, and air movement within the room. However, these ionizers do indeed emit a high and optimum level of negative ions into a room. The coverage is approximately 400 square feet (e.g. a 20′ by 20′ room). That’s 4000 cubic feet, if you have 10′ high ceilings.
