If you're looking to replace a 25 x 25 inch disposable filter, you'll need a standard size 25 x 25 inch electrostatic air filter. Electrostatic air filters are tested according to the National ASHRAE (American Society of Heating, Refrigeration and Air Conditioning Engineers) laboratory standards and use the ASHRAE 52-76 test procedures for air filters. These filters clean the air using static electricity, a natural and safe phenomenon. Cleaning an electrostatic air filter is quick and easy. If done correctly, it can provide you with many years of trouble-free use.
However, if the filter is not cleaned properly, its effectiveness may be reduced and, as with any air filter, excessive accumulation of dirt may cause sufficient resistance to airflow to damage other ventilation components.
