Energy usage varies between devices and the manufacturer specifications can be different in relation to the air purifier models that are available. The first step is to determine the power requirements of the air purifier by using a measuring device such as watts at 12 hours. The figure is the measurement of watts per hour or the amount of energy required to clean one square foot of room for one hour. The unit of measurement is the cubic feet or CF.
The cost per hour or cost per cubic feet is then used to determine the power consumption of the air purifier. The next step is to multiply the measured energy consumption by the measured cubic feet of air in order to get the number of gallons used to clean a single area. The number of cubic feet used represents the total number of hours. The result will be the cost per cubic feet.
The efficiency of the air purifiers is measured in terms of the average energy consumption per unit of area. A higher efficiency rating indicates that the air purifier operates at a lower cost per energy unit. Another way of looking at the efficiency of the air purifiers is the percent load factor hepa air purifier. The percent load factor indicates the percent of the energy used that is lost through ventilation. Air purifiers with high load factors are more expensive than those with low load factors.